Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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MATERIALS AND METHODS FOR INCREASING THE TOCOPHEROL CONTENT IN SEED OIL
FIELD OF THE INVENTION
This application claims priority to U.S. Provisional Patent Application Serial
Number 62/079622
application number filed November 14, 2014 and to U.S. Provisional Patent
Application Serial
Number 62/234373 filed September 29, 2015, which are incorporated herein by
reference in their
entirety.
The Sequence Listing, which is a part of the present disclosure, is submitted
concurrently with
the specification as a text file. The subject matter of the Sequence Listing
is incorporated herein
in its entirety by reference.
The present invention relates generally to the field of molecular biology and
concerns increasing
the tocopherol content of a plant relative to a control plant, comprising
expressing in a plant at
least one polynucleotide encoding a delta-12-desaturase, at least one
polynucleotide encoding a
delta-6-desaturase, at least one polynucleotide encoding a delta-6-elongase,
and at least one
polynucleotide encoding a delta-5-desaturase. The present invention also
relates to methods for
the manufacture of oil, fatty acid- or lipids-containing compositions, and to
such oils and lipids as
such.
BACKGROUND OF THE INVENTION
Fatty acids are carboxylic acids with long-chain hydrocarbon side groups that
play a fundamental
role in many biological processes. Fatty acids are rarely found free in nature
but, rather, occur in
esterified form as the major component of lipids. As such, lipids/fatty acids
are sources of energy
(e.g., beta-oxidation). In addition, lipids/fatty acids are an integral part
of cell membranes and,
therefore, are indispensable for processing biological or biochemical
information.
Very long chain polyunsaturated fatty acids (VLC-PUFAs) such as
docosahexaenoic acid (DHA,
22:6(4,7,10,13,16,19)) are essential components of cell membranes of various
tissues and
organelles in mammals (e.g. nerve, retina, brain and immune cells). Clinical
studies have shown
that DHA is essential for the growth and development of the brain in infants,
and for maintenance
of normal brain function in adults (Martinetz, M. (1992) J. Pediatr. 120:S129
S138). DHA also has
significant effects on photoreceptor function involved in the signal
transduction process,
rhodopsin activation, and rod and cone development (Giusto, N.M., et al.
(2000) Prog. Lipid Res.
39:315-391). In addition, some positive effects of DHA were also found on
diseases such as
hypertension, arthritis, atherosclerosis, depression, thrombosis and cancers
(Horrocks, L.A. and
Yeo, Y.K. (1999) Pharmacol. Res. 40:211-215). Therefore, an appropriate
dietary supply of DHA
is important for human health. The human body is able to convert
eicosapentaenoic acid (EPA,
20:5(5,8,11,14,17)) into DHA. EPA is normally found in marine food and is
abundant in oily fish
from the North Atlantic. In addition to serving as a precursor to DHA, EPA can
also be converted
into eicosanoids in the human body. The eicosanoids produced from EPA have
anti-inflammatory
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and anti-platelet aggregating properties. A large number of beneficial health
effects have been
shown for DHA or mixtures of EPA and DHA.
Vitamin E (tocopherol) is a lipid soluble antioxidant that is important for
preventing oxidative
damage in both plants and animals and is known to have a beneficial effect in
the prevention of
cardiovascular disease. Vitamin E naturally occurs in vegetable oils, where it
functions to prevent
oxidative damage. Vegetable oils therefore represent a useful source of
vitamin E in the human
diet. Additionally, vitamin E extracted from vegetable oils is used as an
additive in other food,
health supplement, and cosmetic products.
Up to now it has not been possible to correlate vitamin E concentration with
any n-3 VLC-PUFA
(i.e., EPA or DHA) component of oil. Vitamin E occurs in plants as various
forms of tocopherol,
including alpha-, beta-, gamma-, and delta. A study containing 52 landraces
and 15 breeding lines
of Brassica napus revealed a significant positive correlation between alpha-
tocopherol and
18:1+18:2, but no correlation between gamma-tocopherol and any fatty acid
component (Li et al.
(2013) J Agric Food Chem 61:34-40). Tocopherol concentrations have not been
correlated with
the degree of unsaturation in various Brassica napus seeds with genetically
altered fatty acid
composition (Abidi et al (1999) J Am Oil Chem Soc 76, 463-467, and Dolde et al
(1999) J Am Oil
Chem Soc 76, 349-355).
There is thus the need to provide a reliable source for plants, in particular
seeds, comprising
tocopherol in preferably high concentrations.
SUMMARY OF THE INVENTION
The invention is thus concerned with a method for increasing the tocopherol
content of a plant
relative to a control plant, comprising expressing in a plant at least one
polynucleotide encoding
a delta-12-desaturase, at least one polynucleotide encoding a delta-6-
desaturase, at least one
polynucleotide encoding a delta-6-elongase, and at least one polynucleotide
encoding a delta-5-
desaturase.
In an embodiment, the method further comprises expressing in the plant at
least one
polynucleotide encoding an omega-3-desaturase.
In an embodiment, the method further comprises expressing in the plant at
least one
polynucleotide encoding a delta-5-elongase.
In an embodiment, the method further comprises expressing in the plant at
least one
polynucleotide encoding a delta-4-desaturase. Preferably, two or more
polynucleotides encoding
a delta-4-desaturase are expressed. More preferably, at least one
polynucleotide encoding a
Coenzyme A dependent delta-4-desaturase and at least one polynucleotide
encoding a
phospholipid dependent delta-4-desaturase.
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Preferably, at least two of the further polynucleotides are expressed.
Further, the present
invention contemplates the expression of all three further polynucleotides.
Thus, the method may
further comprise expressing at least one polynucleotide encoding a delta-5-
elongase, at least one
polynucleotide encoding a delta-4-desaturase (preferably at least one
polynucleotide for a
Coenzyme A dependent delta-4 desaturase and at least one for a phospholipid
dependent delta-
4 desaturase), and at least one polynucleotide encoding an omega-3 desaturase.
Moreover, the method of the present invention may further comprise expressing
in the plant at
least one polynucleotide encoding a delta-15-desaturase.
In an embodiment, at least one polynucleotide encoding a delta-6 elongase from
Physcomitrella
patens, at least one polynucleotide encoding a delta-12 desaturase from
Phythophthora sojae, at
least one polynucleotide encoding a delta-6 desaturase from Ostreococcus
tauri, at least one
polynucleotide encoding a delta-6 elongase from Thalassiosira pseudonana, at
least one
polynucleotide (preferably at least two polynucleotides) encoding a delta-5
desaturase from
Thraustochytrium sp. (preferably from Thraustochytrium sp. ATCC21685), and
optionally at least
one polynucleotide (preferably, at least two polynucleotides) encoding a omega-
3 desaturase
from Pythium irregulare, at least one polynucleotide encoding a omega-3-
desaturase from
Phythophthora infestans, at least one polynucleotide encoding a delta-5
elongase from
Ostreococcus tauri, and at least one polynucleotide encoding a delta-4
desaturase from
Thraustochytrium sp., and at least one polynucleotide encoding a delta-4
desaturase from
Pavlova lutheri are expressed. Preferably, at least two polynucleotides
encoding a delta-5
desaturase from Thraustochytrium sp. (preferably from Thraustochytrium sp.
ATCC21685) are
expressed. Moreover, it is envisaged to express at least two polynucleotides
encoding a omega-
3 desaturase from Pythium irregulare. As set forth elsewhere herein, also
variants of the
aforementioned polynucleotides can be expressed.
In accorandance with the method of the present invention, it is envisaged that
at least one
polynucleotide encoding a delta-12-desaturase, at least one polynucleotide
encoding a delta-6-
desaturase, at least two polynucleotides encoding a delta-6-elongase, at least
two
polynucleotides encoding a delta-5-desaturase, and optionally at least three
polynucleotides
encoding an omega-3-desaturase, and at least one polynucleotide encoding a
delta-5-elongase,
and at least two polynucleotides encoding a delta-4-desaturase are expressed.
Preferably, at
least one polynucleotide encoding a Coenzyme A dependent delta-4-desaturase
and at least one
polynucleotide encoding a phospholipid dependent delta-4-desaturase are
expressed.
In an embodiment, the polynucleotides are expressed in the seeds of the plant.
In accordance with the present invention, the tocopherol content shall be
preferably increased in
the seeds of the plant as compared to the tocopherol content in seeds of a
control plant, in
particular the tocopherol content is increased in the seed oil of the plant as
compared to the seed
oil of a control plant.
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Preferably, the polynucleotides encoding the elongases and desaturases
referred to above are
recombinant polynucleotides. They may be expressed in a plant by introducing
them into the plant
by recombinant means such as Agrobacterium-mediated transformation. Thus, the
method may
comprise the steps of introducing and expressing the above-referenced
polynucleotides.
In one embodiment, the method may further comprise the step of selecting for
plants having an
increased tocopherol content (as compared to a control plant).
In accordance with the present invention, polynucleotides are referred to
herein above present
on one T-DNA or construct (and thus on the same T-DNA or construct). Said
construct or T-DNA
shall be is stably integrated in the genome of the plant. In an embodiment,
the plant is
homozygous for the T-DNA. In another embodiment, the plant is hemizygous for
the T-DNA. If
the plant is homozygous for one T-DNA at one locus, this is nevertheless
considered as a single
copy herein, i.e. as one copy. Double copy, as used herein, refers to a plant
in which two T-DNAs
have been inserted, at one or two loci, and in the hemizygous or homozygous
state.
The present invention also relates to a construct or T-DNA comprising
expression cassettes for
the polynucleotides as set forth in the context of method of the present
invention for increasing
the tocopherol content.
Preferably, the construct or T-DNA shall comprise expression cassettes for at
least one
polynucleotide encoding a delta-12-desaturase, at least one polynucleotide
encoding a delta-6-
desaturase, at least one polynucleotide encoding a delta-6-elongase, and at
least one
polynucleotide encoding a delta-5-desaturase, and optionally for at least one
of the further
polynucleotides encoding the desaturases or elongases referred to above.
The present invention further concerns the use of the polynucleotides as set
forth in the context
of the present invention, or of a construct or T-DNA comprising expression
cassettes for said
polynucleotides for increasing the tocopherol content of a plant relative to
control plants.
The present invention also relates to a plant comprising expression cassettes
for the
polynucleotides as referred to in the context of the method of the present
invention for increasing
the tocopherol content, or comprising the T-DNA or construct of the present
invention.
The present invention also relates to a seed of the plant of the present
invention. Said seed shall
comprise expression cassettes for the polynucleotides as referred to in the
context of the method
of the present invention for increasing the tocopherol content, or comprising
the T-DNA or
construct of the present invention. In an embodiment, the seed shall comprise
an of oil the present
invention. The oil is described herein below.
Preferably, the method for increasing the tocopherol content comprises the
further step of
obtaining an oil from the plant, in particular from the seeds of the plant.
Said oil shall have an
increased tocopherol content as specified elsewhere herein. In addition, the
oil shall have an
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increased content of VLC-PUFAs. In accordance with the present invention, the
oil shall be
obtained from the plant under conditions which maintain the tocopherol
content. Such methods
are well known in the art.
The invention also provides methods of producing an oil, wherein the oil has a
high content of
tocopherol. In addition, the oil may have a high VLC-PUFA content, in
particular a high content of
EPA and/or DHA. In particularly preferred aspects these methods are for
producing a
corresponding plant oil. Thus, the invention also provides methods of
producing an oil.
The invention also provides methods for creating a plant, such that the plant
or progeny thereof
can be used as a source of an oil having a high content of tocopherol.
Preferably, the oil further
has a high VLC-PUFA content, in particular a high content of EPA and/or DHA.
Thus, the invention
beneficially also provides methods for the production of plants having a
heritable phenotype of
high tocopherol content in seed oil. Further, the plants may have a hight VLC-
PUFA content in
one or more of their tissues or components, preferably a high content of EPA
and/or DHA in seed
oil.
DETAILED DESCRIPTION OF THE INVENTION
Various aspects of the invention are hereinafter described in more detail. The
definitions and
explantions given in the previous section apply accordingly. It is to be
understood that the detailed
description is not intended to limit the scope of the claims.
Tocopherols are well known in the art. The term "content of tocopherol"
preferably refers to the
total tocopherol content, i.e. to the sum of the amounts of the tocopherols
present in the plant,
plant part (preferably in the seed) or oil (in particular in seed oil)
thereof. In particular, the term
refers to the sum of the amounts of alpha-tocopherol, beta-tocopherol, gamma-
tocopherol, and
delta-tocopherol. However, it is also envisaged that term refers to the amount
of alpha-tocopherol,
the amount of beta-tocopherol, andr to the amount of gamma-ocopherol, or the
amount of delta-
tocopherol. In a preferred embodiment, the term refers to the amount of gamma-
tocopherol. In
another preferred embodiment, the term term to the amount of delta-tocopherol.
Also preferably,
the term refers to the amount of total tocopherol, gamma-tocopherol and/or
delta-tocopherol.
Thus, "tocopherol" in the context of the present invention, preferably, refers
to total tocopherol,
alpha-tocopherol, beta-tocopherol, gamma-tocopherol, and/or delta-tocopherol.
In particular, the
term refers to total tocopherol, gamma-tocopherol, or delta-tocopherol
The term "amount" or "content" preferably refers to the absolute amount or the
concentration
(preferably, in the plant, more preferably in the seed and most preferably in
the seed oil). In an
embomdiment, the content of tocopherol is increased in the seed oil of a plant
as compared to
the seed oil of a control plant.
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Increasing the content of tocopherols refers to the increase of the content of
tocopherols in a
plant, or a part, tissue or organ thereof, preferably in the seed, in
particular in the oil compared to
a control plant by at least 1%, at least 5%, at least 10%, at least 12% or at
least 15%.
An "increased content" or "high content" of tocopherol as referred to herein
preferably refers to a
total content of tocopherol in seed oil of more than 97 mg/100 g seed oil, in
particular of more
than 100 mg/100 g seed oil, a content of alpha tocopherol in seed oil of more
than 31 mg/100 g
seed oil, in particular of more than 33 mg/100 g seed oil, a content of beta
tocopherol in seed oil
of more than 0.6 mg/100 g seed oil, a content of gamma tocopherol in seed oil
of more than 65
mg/100 g seed oil, in particular of more than 70 mg/100 g seed oil, or a
content of delta tocopherol
in seed oil of more than 1.4 mg/100 g seed oil, in particular of more than 1.5
mg/100 g seed oil.
Also, an "increased content" or "high content" of tocopherol as referred to
herein preferably refers
to a total seed content of tocopherol of more than 35 mg/100 g seed, in
particular of more than
39 mg/100 g seed, a seed content of alpha tocopherol in seed of more than 12
mg/100 g seed,
in particular of more than 13 mg/100 g seed, a seed content of beta tocopherol
in seed of more
than 0.22 mg/100 g seed, a seed content of gamma tocopherol in seed of more
than 25 mg/100
g seed, in particular of more than 26 mg/100 g seed, or a seed content of
delta tocopherol in seed
of more than 0.45 mg/100 g seed, in particular of more than 0.48 mg/100 g
seed.
The seeds, in particular the oil, may further comprise a high VLC-PUFA (very
long chain
polyunsaturated fatty acid) content.
The choice of suitable control plants is a routine part of an experimental
setup and may include
corresponding wild type plants or corresponding plants without the
polynucleotides as encoding
desaturases and elongase as referred to herein. The control plant is typically
of the same plant
species or even of the same variety as the plant to be assessed. The control
plant may also be a
nullizygote of the plant to be assessed. Nullizygotes (or null control plants)
are individuals missing
the transgene by segregation. Further, control plants are grown under the same
or essentially the
same growing conditions to the growing conditions of the plants of the
invention, i.e. in the vicinity
of, and simultaneously with, the plants of the invention. A "control plant" as
used herein preferably
refers not only to whole plants, but also to plant parts, including seeds and
seed parts. The control
could also be the oil from a control plant.
Preferably, the control plant is an isogenic control plant (thus, the control
oil e.g. shall be from an
isogenic control plant).
The term "polyunsaturated fatty acids (PU FA)" as used herein refers to fatty
acids comprising at
least two, preferably, three, four, five or six, double bonds. Moreover, it is
to be understood that
such fatty acids comprise, preferably from 18 to 24 carbon atoms in the fatty
acid chain. More
preferably, the term relates to long chain PUFA (VLC-PUFA) having from 20 to
24 carbon atoms
in the fatty acid chain. Particularly, polyunsaturated fatty acids in the
sense of the present
invention are DHGLA 20:3 (8,11,14), ARA 20:4 (5,8,11,14), ETA 20:4
(8,11,14,17), EPA 20:5
(5,8,11,14,17), DPA 22:5 (4,7,10,13,16), DPA n-3 (7,10,13,16,19) DHA 22:6
(4,7,10,13,16,19),
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more preferably, eicosapentaenoic acid (EPA) 20:5 (5,8,11,14,17), and
docosahexaenoic acid
(DHA) 22:6 (4,7,10,13,16,19). Thus, it will be understood that most
preferably, the methods
provided by the present invention pertain to the manufacture of EPA and/or DHA
and/or
tocopherol. Moreover, also encompassed are the intermediates of VLC-PUFA which
occur during
synthesis. Such intermediates are, preferably, formed from substrates by the
desaturase, keto-
acyl-CoA-synthase, keto-acyl-CoA-reductase, dehydratase and enoyl-CoA-
reductase activity of
the polypeptide of the present invention. Preferably, substrates encompass LA
18:2 (9,12), GLA
18:3 (6,9,12), DHGLA 20:3 (8,11,14), ARA 20:4 (5,8,11,14), eicosadienoic acid
20:2 (11,14),
eicosatetraenoic acid 20:4 (8,11,14,17), eicosapentaenoic acid 20:5
(5,8,11,14,17). Systematic
names of fatty acids including polyunsaturated fatty acids, their
corresponding trivial names and
shorthand notations used according to the present invention are given in the
following table:
Short Short
Systematic name Trivial Name
hand 1 hand 2
Hexadecanoic acid Palmitic acid 16:0
(Z)-7-Hexadecenoic acid 16:1n-9
(Z,Z,Z)-7,10,13-Hexadecatrienoic acid 16:3n-3
Octadecanoic acid Stearic acid 18:0
(Z)-9-Octadecenoic acid Oleic acid 18:1n-9 OA
(Z,Z)-9,12-Octadecadienoic acid Linoleic acid 18:2n-6 LA
(Z,Z)-6,9-Octadecadienoic acid 18:2n-9
alpha-Linolenic ALA
(Z,Z,Z)-9,12,15-Octadecatrienoic acid18:3n-3
acid
(Z,Z,Z)-6,9,12-Octadecatrienoic acid gamma-Linolenic 18:3n-6
GLA
acid
(Z,Z,Z,Z)-6,9,12,15-Octadecatetraenoic acid Stearidonic acid 18:4n-3
SDA
Eicosanoic acid Arachidic acid 20:0
(Z)-11-Eicosenoic acid Gondoic acid 20:1n-9
(Z,Z)-11,14-Eicosadienoic acid 20:2n-6
(Z,Z,Z)-11,14,17-Eicosatrienoic acid 20:3n-3
Dihomo-gamma- DHGLA
(Z,Z,Z)-8,11,14-Eicosatrienoic acid20:3n-6
linolenic acid
(Z,Z,Z)-5,8,11-Eicosatrienoic acid Mead acid 20:3n-9
(Z,Z,Z,Z)-8,11,14,17-Eicosatetraenoic acid 20:4n-3 ETA
(Z,Z,Z,Z)-5,8,11,14-Eicosatetraenoic acid Arachidonic acid 20:4n-6
ARA
(Z,Z,Z,Z,Z)-5,8,11,14,17-Eicosapentaenoic acid Timnodonic acid 20:5n-3
EPA
Docosanoic acid Behenic acid 22:0
(Z)-13-Docosenoic acid Erucic acid 22:1n-9
(Z,Z,Z,Z)-7,10,13,16-Docosatetraenoic acid Adrenic acid 22:4n-6 DTA
(Z,Z,Z,Z,Z)-7,10,13,16,19-Docosapentaenoic acid Clupanodonic acid 22:5n-3
DPAn-3
(Z,Z,Z,Z,Z)-4,7,10,13,16-Docosapentaenoic acid Osbond acid 22:5n-6 DPAn-
6
(Z,Z,Z,Z,Z,Z)-4,7,10,13,16,19-Docosahexaenoic DHA
226n-3
acid
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The term "cultivating" as used herein refers to maintaining and growing the
transgenic plant under
culture conditions which allow the cells to produce tocopherol in a plant, a
seed comprising an
increased tocopherol content or an oil comprising and increased tocopherol
content (as compared
to a control). This implies that the polynucleotides as referred to herein in
connection with the
method of the present invention are present in the plant. Suitable culture
conditions for cultivating
the host cell are described in more detail below.
Preferably, the polynucleotides encoding the enzymes as referred to herein are
stably integrated
into the genome of the plant. More preferably, the polynucleotides are present
on one T-DNA or
construct which is stably integrated into the genome of the plant. Thus, they
are preferably present
on a single, i.e. the same T-DNA (or construct). The same applies to the
expression cassettes as
referred to herein. Accodingly, the polynucleotides or expression cassttes are
preferably
comprised by the same T-DNA.
It is to be understood that more than one copy of the T-DNA (or construct) may
be present in the
plant (e.g. in plants which are homozygous for the T-DNA (or construct), or in
plants in which
Agrobacterium mediated transformation resulted in more than one integration
event.
The term "obtaining" as used herein encompasses the provision of the cell
culture including the
host cells and the culture medium or the plant or plant part, particularly the
seed, of the current
invention, as well as the provision of purified or partially purified
preparations thereof comprising
the tococpherol The plant, plant part or purified or partially purified
preparations may further
comprise the polyunsaturated fatty acid, preferably, ARA, EPA, DHA, in free or
in CoA bound
form, as membrane phospholipids or as triacylglyceride esters. More
preferably, the PUFA and
VLC-PUFA are to be obtained as triglyceride esters, e.g., in the form of an
oil. More details on
purification techniques can be found elsewhere herein below.
The term "polynucleotide" according to the present invention refers to a
desoxyribonucleic acid
or ribonucleic acid. Unless stated otherwise, "polynucleotide" herein refers
to a single strand of a
DNA polynucleotide or to a double stranded DNA polynucleotide. The length of a
polynucleotide
is designated according to the invention by the specification of a number of
basebairs ("bp") or
nucleotides ("nt"). According to the invention, both specifications are used
interchangeably,
regardless whether or not the respective nucleic acid is a single or double
stranded nucleic acid.
Also, as polynucleotides are defined by their respective nucleotide sequence,
the terms
nucleotide/polynucleotide and nucleotide sequence/polynucleotide sequence are
used
interchangeably, thus that a reference to a nucleic acid sequence also is
meant to define a nucleic
acid comprising or consisting of a nucleic acid stretch, the sequence of which
is identical to the
nucleic acid sequence.
In particular, the term "polynucleotide" as used in accordance with the
present invention as far as
it relates to a desaturase or elongase gene relates to a polynucleotide
comprising a nucleic acid
sequence which encodes a polypeptide having desaturase or elongase activity.
Preferred
polynucleotides encoding polypeptides having desaturase or elongase activity
as shown in Table
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2 in the Examples section (the SEQ ID NOs of the nucleic acid sequences and
the polypeptide
sequences are given in the last two columns).
Preferably, the polypeptides encoded by the polynucleotides of the present
invention having
desaturase or elongase activity upon combined expression in a plant shall be
capable of
increasing the content, and thus the amount of tocopherol in a plant in
particular, in seeds, seed
oils or an entire plant or parts thereof. Whether an increase is statistically
significant can be
determined by statistical tests well known in the art including, e.g.,
Student's t-test with a
confidentiality level of at least 90%, preferably of at least 95% and even
more preferably of at
least 98%. More preferably, the increase is an increase of the amount of
tocopherol of at least
1%, at least 5%, at least 10%, at least 12% or at least 15% (preferably, by
weight) compared to
a control, in particular to the content in seeds, seed oil, crude oil, or
refined oil from a control.
In addition, the polypeptides having desaturase or elongase activity upon
combined expression
in a plant shall be capable of increasing the amount of PUFA and, in
particular, VLC-PUFA in,
e.g., seed oils or an entire plant or parts thereof. More preferably, the
increase is an increase of
the amount of triglycerides containing VLC-PUFA of at least 5%, at least 10%,
at least 15%, at
least 20% or at least 30% (preferably by weight) compared to wild-type
control, in seeds, seed
oil, crude oil, or refined oil from a wildtype control.
Thus, the present invention allows for producing an oil having not only an
increased tocopherol
content as compared to tocopherol content of oil of control plants but also an
increased content
of PUFA, in particular, of VLC-PUFA.
Preferably, the VLC-PUFA referred to before is a polyunsaturated fatty acid
having a C20, C22
or C24 fatty acid body, more preferably EPA and/or DHA. Lipid analysis of oil
samples are shown
in the accompanying Examples.
The fatty acid esters with polyunsaturated C20- and/or C22-fatty acid
molecules can be isolated
in the form of an oil or lipid, for example, in the form of compounds such as
sphingolipids,
phosphoglycerides, lipids, glycolipids such as glycosphingolipids, phos-
pholipids such as
phosphatidylethanolamine, phosphatidylcholine, phosphatidylserine,
phosphatidylglycerol,
phosphatidylinositol or diphosphatidylglycerol, monoacylglycerides,
diacylglycerides,
triacylglycerides or other fatty acid esters such as the acetylcoenzyme A
esters which comprise
the polyunsaturated fatty acids with at least two, three, four, five or six,
preferably five or six,
double bonds, from the organisms which were used for the preparation of the
fatty acid esters.
Preferably, they are isolated in the form of their diacylglycerides,
triacylglycerides and/or in the
form of phosphatidylcholine, especially preferably in the form of the
triacylglycerides. In addition
to these esters, the polyunsaturated fatty acids are also present in the non-
human transgenic
organisms or host cells, preferably in the plants, as free fatty acids or
bound in other compounds.
The fatty acids are, preferably, produced in bound form. It is possible, with
the aid of the
polynucleotides and polypeptides of the present invention, for these
unsaturated fatty acids to be
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positioned at the sn1, sn2 and/or sn3 position of the triglycerides which are,
preferably, to be
produced.
The desaturares and elongases referred to herein are well known in the art.
The term "desaturase" encompasses all enzymatic activities and enzymes
catalyzing the
desaturation of fatty acids with different lengths and numbers of unsaturated
carbon atom double
bonds. Specifically this includes delta 4 (d4)-desaturase, preferably
catalyzing the
dehydrogenation of the 4th and 5th carbon atom; Delta 5 (d5)-desaturase
catalyzing the
dehydrogenation of the 5th and 6th carbon atom; Delta 6 (d6)-desaturase
catalyzing the
dehydrogenation of the 6th and 7th carbon atom; Delta 15 (d15)-desaturase
catalyzing the
dehydrogenation of the 15th and 16th carbon atom. An omega 3 (o3) desaturase
preferably
catalyzes the dehydrogenation of the n-3 and n-2 carbon atom.
The terms "elongase" encompasses all enzymatic activities and enzymes
catalyzing the
elongation of fatty acids with different lengths and numbers of unsaturated
carbon atom double
bonds. Preferably, the term "elongase" as used herein refers to the activity
of an elongase,
introducing two carbon molecules into the carbon chain of a fatty acid,
preferably in the positions
1, 5, 6, 9, 12 and/or 15 of fatty acids.
In a preferred embodiment, the term "elongase" shall to the activity of an
elongase, introducing
two carbon molecules to the carboxyl ends (Le. position 1) of both saturated
and unsaturated fatty
acids.
In the studies underlying this invention, enzymes with superior desaturase and
elongase catalytic
activities for the increasing the content of tocopherol has been provided.
Table 2 in the Examples
section lists preferred polynucleotides encoding for preferred desaturases or
elongase to be used
in the present invention. Thus, polynucleotides desaturases or elongases that
can be used in the
context of the present invention are shown in table 2. As set forth elsewhere
herein, also variants
of the said polynucleotides can be used.
Polynucleotides encoding polypeptides which exhibit delta-6-elongase activity
have been
described in W02001/059128, W02004/087902 and W02005/012316, said documents,
describing this enzyme from Physcomitrella patens, are incorporated herein in
their entirety.
Polynucleotides encoding polypeptides which exhibit delta-5-desaturase
activity have been
described in W02002026946 and W02003/093482, said documents, describing this
enzyme
from Thraustochytrium sp., are incorporated herein in their entirety.
Polynucleotides encoding polypeptides which exhibit delta-6-desaturase
activity have been
described in W02005/012316, W02005/083093, W02006/008099 and W02006/069710,
said
documents, describing this enzyme from Ostreococcus tauri, are incorporated
herein in their
entirety.
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In an embodiment, the delta-6-desaturase is a CoA (Coenzyme A)-dependent delta-
6-
desaturase.
Polynucleotides encoding polypeptides which exhibit delta-6-elongase activity
have been
described in W02005/012316, W02005/007845 and W02006/069710, said documents,
describing this enzyme from Thalassiosira pseudonana, are incorporated herein
in their entirety.
Polynucleotides encoding polypeptides which exhibit delta-12-desaturase
activity have been
described for example in W02006100241, said documents, describing this enzyme
from
Phytophthora sojae, are incorporated herein in their entirety.
Polynucleotides encoding polypeptides which exhibit delta-4-desaturase
activity have been
described for example in W02004/090123, said documents, describing this enzyme
from Euglena
gracilis, are incorporated herein in their entirety.
Polynucleotides encoding polypeptides which exhibit delta-5-elongase activity
have been
described for example in W02005/012316 and W02007/096387, said documents,
describing this
enzyme from Ostreococcus tauri, are incorporated herein in their entirety.
Polynucleotides encoding polypeptides which exhibit omega 3-desaturase
activity have been
described for example in W02008/022963, said documents, describing this enzyme
from Pythium
irregulare, are incorporated herein in their entirety.
Polynucleotides encoding polypeptides which exhibit omega 3-desaturase
activity have been
described for example in W02005012316 and W02005083053, said documents,
describing this
enzyme from Phytophthora infestans, are incorporated herein in their entirety.
Polynucleotides encoding polypeptides which exhibit delta-4-desaturase
activity have been
described for example in W02002026946, said documents, describing this enzyme
from
Thraustochytrium sp., are incorporated herein in their entirety.
Polynucleotides coding for a delta-4 desaturase from Pavlova lutheri are
described in
W02003078639 and W02005007845. These documents are incorporated herein in
their entirety,
particularly insofar as the documents relate to the delta-4 desaturase "PIDES
1"and figures 3a-
3d of W02003078639 and figures 3a, 3b of W02005007845, respectively.
Polynucleotides encoding polypeptides which exhibit delta-15-desaturase
activity have been
described for example in W02010/066703, said documents, describing this enzyme
from
Cochliobolus heterostrophus C5, are incorporated herein in their entirety.
The polynucleotides encoding the aforementioned polypeptides are herein also
referred to as
"target genes" or "nucleic acid of interest". The polynucleotides are well
known in the art. The
sequences of said polynucleotides can be found in the sequence of the T-DNA
disclosed in the
Examples section (see e.g. the sequence of VC-LTM593-1qcz which has a sequence
as shown
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in SEQ ID NO: 3, see also Table 1). The polynucleotide and polypeptide
sequences are also
given in Table 2 in the Examples section.
Sequences of preferred polynucleotides for the desaturases and elongases
referred to herein in
connection with the present invention are indicated below. As set forth
elsewhere herein, also
variants of the polynucleotides can be used. The polynucleotides encoding for
desaturases and
elogases to be used in accordance with the present invention can be derived
from certain
organisms. Preferably, a polynucleotide derived from an organism (e.g from
Physcomitrella
patens) is codon-optimized. In particular, the polynucleotide shall be codon-
optimized for
expression in a plant.
The term "codon-optimized" is well understood by the skilled person.
Preferably, a codon
optimized polynucleotide is a polynucleotide which is modified by comparison
with the nucleic
acid sequence in the organism from which the sequence originates in that it is
adapted to the
codon usage in one or more plant species. Typically, the polynucleotide, in
particular the coding
region, is adapted for expression in a given organism (in particular in a
plant) by replacing at least
one, or more than one of codons with one or more codons that are more
frequently used in the
genes of that organism (in particular of the plant). In accordance with the
present invention, a
codon optimized variant of a particular polynucleotide "from an organism" (or
"derived from an
organism") preferably shall be considered to be a polynucleotide derived from
said organism.
Preferalby, a codon-optimized polynucleotide shall encode for the same
polypeptide having the
same sequence as the polypeptide encoded by the non codon-optimized
polynucleotide (i.e. the
wild-type sequence). In the studies underlying the present invention, codon
optimized
polynucleotides were used (for the desaturases). The codon optimized
polynucleotides are
comprised by the T-DNA of the vector having a sequence as shown in SEQ ID NO:
3 (see table
1).
The sequences of preferred polynucleotides for the desaturases and elongases
and the
sequences corresponding polypeptides referred to herein in connection with the
present invention
are described herein below. Of course variants of polynucleotides and
polynucleotides can be
used in connection with the present invention (in particular in connection
with the methods, T-
DNAs, constructs, plants, seeds, etc.).
Preferably, a delta-6-elongase to be used in accordance with the present
invention is derived from
Physcomitrella patens. A preferred sequence of said delta-6-elongase is shown
in SEQ ID
NO:258. Preferably, said delta-6-elongase is encoded by a polynucleotide
derived from
Physcomitrella patens, in particular, said delta-6-elongase is encoded by a
codon-optimized
variant thereof. Preferably, the polynucleotide encoding the delta-6-elongase
derived from
Physcomitrella patens is a polynucleotide having a sequence as shown in
nucleotides 1267 to
2139 of SEQ ID NO: 3. The sequence of this polynucleotide is also shown in SEQ
ID No: 257.
Preferably, a delta-5-desaturase to be used in accordance with the present
invention is derived
from Thraustochytrium sp.. Thraustochytrium sp. in the context of the present
invention preferably
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means Thraustochytrium sp. ATCC21685. A preferred sequence of said delta-5-
desaturase is
shown in SEQ ID NO:260. Preferably, said delta-5-desaturase is encoded by a
polynucleotide
derived from Thraustochytrium sp.; in particular, said delta-5-desaturase is
encoded by a codon-
optimized variant of said polynucleotide. Preferably, the polynucleotide
encoding the delta-5-
desaturase derived from Thraustochytrium sp. is a polynucleotide having a
sequence as shown
in nucleotides 3892 to 5211 of SEQ ID NO: 3. The sequence of this
polynucleotide is also shown
in SEQ ID No: 259. In accordance with the present invention, it is envisaged
to express two or
more polynucleotides (i.e. two or more copies of a polynucleotide) encoding a
delta-5-desaturase
derived from Thraustochytrium sp. (preferably two polynucleotides). Thus, the
T-DNA, construct,
plant, seed etc. of the present invention shall comprise two (or more) copies
of a polynucleotide
encoding a delta-5-desaturase derived from Thraustochytrium sp..
Preferably, a delta-6-desaturase to be used in accordance with the present
invention is derived
from Ostreococcus tauri. A preferred sequence of said delta-6-desaturase is
shown in SEQ ID
NO:262. Preferably, said delta-6-desaturase is encoded by a polynucleotide
derived from
Ostreococcus tauri; in particular, said delta-6-desaturase is encoded by a
codon-optimized variant
of said polynucleotide. Preferably, the polynucleotide encoding the delta-6-
desaturase derived
from Ostreococcus tauri is a polynucleotide having a sequence as shown in
nucleotides 7802 to
9172 of SEQ ID NO: 3. The sequence of this polynucleotide is also shown in SEQ
ID No: 261.
Preferably, a delta-6-elongase to be used in accordance with the present
invention is derived from
Thalassiosira pseudonana. A preferred sequence of said delta-6-elongase is
shown in SEQ ID
NO:264. Preferably, said delta-6-elongase is encoded by a polynucleotide
derived from
Thalassiosira pseudonana; in particular, said delta-6-elongase is encoded by a
codon-optimized
variant of said polynucleotide. Preferably, the polynucleotide encoding the
delta-6-elongase
derived from Thalassiosira pseudonana is a polynucleotide having a sequence as
shown in
nucleotides 12099 to 12917 of SEQ ID NO: 3. The sequence of this
polynucleotide is also shown
in SEQ ID No: 263. (Thus, the polynucleotide encoding the delta-6-elongase
derived from
Thalassiosira pseudonana preferably has a sequence as shown in SEQ ID NO: 263)
Preferably, a delta-12-elongase to be used in accordance with the present
invention is derived
from Phytophthora sojae. A preferred sequence of said delta-12-elongase is
shown in SEQ ID
NO:266. Preferably, said delta-12-elongase is encoded by a polynucleotide
derived from
Phytophthora sojae; in particular, said delta-12-elongase is encoded by a
codon-optimized variant
of said polynucleotide. Preferably, the polynucleotide encoding the delta-12-
elongase derived
from Phytophthora sojae is a polynucleotide having a sequence as shown in
nucleotides 14589
to 15785 of SEQ ID NO: 3. The sequence of this polynucleotide is also shown in
SEQ ID No: 265.
Preferably, a delta-5-elongase to be used in accordance with the present
invention is derived from
Ostreococcus tauri. A preferred sequence of said delta-5-elongase is shown in
SEQ ID NO:276.
Preferably, said delta-5-elongase is encoded by a polynucleotide derived from
Ostreococcus
tauri; in particular, said delta-5-elongase is encoded by a codon-optimized
variant of said
polynucleotide. Preferably, the polynucleotide encoding the delta-5-elongase
derived from
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Ostreococcus tauri is a polynucleotide having a sequence as shown in
nucleotides 38388 to
39290 of SEQ ID NO: 3. The sequence of this polynucleotide is also shown in
SEQ ID No: 275.
Preferably, an omega 3-desaturase to be used in accordance with the present
invention is derived
from Pythium irregulare. A preferred sequence of said omega 3-desaturase is
shown in SEQ ID
NO:268. Preferably, said omega 3-desaturase is encoded by a polynucleotide
derived from
Pythium irregulare; in particular, said omega 3-desaturase is encoded by a
codon-optimized
variant of said polynucleotide. Preferably, the polynucleotide encoding the
omega 3-desaturase
derived from Pythium irregulare is a polynucleotide having a sequence as shown
in nucleotides
17690 to 18781 of SEQ ID NO: 3. The sequence of this polynucleotide is also
shown in SEQ ID
No: 267. In accordance with the present invention, it is envisaged to express
two or more
polynucleotides (i.e. two or more copies of a polynucleotide) encoding a omega
3-desaturase
derived from Pythium irregulare (preferably two polynucleotides). Thus, the T-
DNA, construct,
plant, seed etc. of the present invention shall comprise two (or more) copies
of a polynucleotide
encoding a omega 3-desaturase derived from Pythium irregulare
Preferably, an omega 3-desaturase to be used in accordance with the present
invention is derived
from Phytophthora infestans. A preferred sequence of said omega 3-desaturase
is shown in SEQ
ID NO:270. Preferably, said omega 3-desaturase is encoded by a polynucleotide
derived from
Phytophthora infestans; in particular, said omega 3-desaturase is encoded by a
codon-optimized
variant of said polynucleotide. Preferably, the polynucleotide encoding the
omega 3-desaturase
derived from Phytophthora infestans is a polynucleotide having a sequence as
shown in
nucleotides 20441 to 21526 of SEQ ID NO: 3. The sequence of this
polynucleotide is also shown
in SEQ ID No: 269.
In accordance with the method of the present invention, it is in particular
envisaged to express
two or more non-identical polynucleotides encoding, preferably non-identical
omega 3-
desaturases in the plant. Preferably, at least one polynucleotide encoding an
omega 3-desaturase
from Phytophthora infestans and at least one polynucleotide (in particular two
polynucleotides,
i.e. two copies of a polynucleotide) encoding an omega 3-desaturase from
Pythium irregulare are
expressed.
Preferably, a delta-4-desaturase to be used in accordance with the present
invention is derived
from Thraustochytrium sp.. A preferred sequence of said delta-4-desaturase is
shown in SEQ ID
NO:272. Preferably, said delta-4-desaturase is encoded by a polynucleotide
derived from
Thraustochytrium sp.; in particular, said delta-4-desaturase is encoded by a
codon-optimized
variant of said polynucleotide. Preferably, the polynucleotide encoding the
delta-4-desaturase
derived from Thraustochytrium sp. is a polynucleotide having a sequence as
shown in nucleotides
26384 to 27943 of SEQ ID NO: 3. The sequence of this polynucleotide is also
shown in SEQ ID
No: 271.
Preferably, a delta-4-desaturase to be used in accordance with the present
invention is derived
from Pavlova lutheri. A preferred sequence of said delta-4-desaturase is shown
in SEQ ID
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NO:274. Preferably, said delta-4-desaturase is encoded by a polynucleotide
derived from Pavlova
lutheri; in particular, said delta-4-desaturase is encoded by a codon-
optimized variant of said
polynucleotide. Preferably, the polynucleotide encoding the delta-4-desaturase
derived from
Pavlova lutheri is a polynucleotide having a sequence as shown in nucleotides
34360 to 35697
of SEQ ID NO: 3. The sequence of this polynucleotide is also shown in SEQ ID
No: 273.
In accordance with the method of the present invention, it is further
envisaged to express two
non-identical polynucleotides encoding, preferably non-identical delta-4-
desaturases in the plant.
Preferably, at least one polynucleotide encoding a delta-4-desaturase from
Thraustochytrium sp.
and at least one polynucleotide (in particular two polynucleotides) encoding a
delta-4-desaturase
from Pavlova lutheri are expressed.
Preferably, a delta-15-desaturase to be used in accordance with the present
invention is derived
from Cochliobolus heterostrophus. Preferably, said delta-15-desaturase is
encoded by a
polynucleotide derived from Cochliobolus heterostrophus; in particular, said
delta-15-desaturase
is encoded by a codon-optimized variant of said polynucleotide. Preferably,
the polynucleotide
encoding the delta-15-desaturase derived from Cochliobolus heterostrophus is a
polynucleotide
having a sequence as shown in nucleotides 2151 to 3654 of SEQ ID NO: 9.
As set forth above, the polynucleotide encoding a delta-6-elongase can be
derived from
Physcomitrella patens. Moreover, the polynucleotide encoding a delta-6-
elongase can be derived
from Thalassiosira pseudonana. In particular, it is envisaged in the context
of the method of the
present invention to express at least one polynucleotide encoding a delta-6-
elongase from
Physcomitrella patens and at least one polynucleotide encoding a delta-6-
elongase from
Thalassiosira pseudonana in the plant.
A polynucleotide encoding a polypeptide having a desaturase or elongase
activity as specified
above is obtainable or obtained in accordance with the present invention for
example from an
organism of genus Ostreococcus, Thraustochytrium, Euglena, Thalassiosira,
Phytophthora,
Pythium, Cochliobolus, Physcomitrella. However, orthologs, paralogs or other
homologs may be
identified from other species. Preferably, they are obtained from plants such
as algae, for example
lsochrysis, Mantoniella, Crypthecodinium, algae/diatoms such as Phaeodactylum,
mosses such
as Ceratodon, or higher plants such as the Primulaceae such as Aleuritia,
Calendula stellata,
Osteospermum spinescens or Osteospermum hyoseroides, microorganisms such as
fungi, such
as Aspergillus, Entomophthora, Mucor or Mortierella, bacteria such as
Shewanella, yeasts or
animals. Preferred animals are nematodes such as Caenorhabditis, insects or
vertebrates.
Among the vertebrates, the nucleic acid molecules may, preferably, be derived
from
Euteleostomi, Actinopterygii; Neopterygii; Teleostei; Euteleostei,
Protacanthopterygii,
Salmoniformes; Salmonidae or Oncorhynchus, more preferably, from the order of
the
Salmoniformes, most preferably, the family of the Salmonidae, such as the
genus Salmo, for
example from the genera and species Oncorhynchus mykiss, Trutta trutta or
Salmo trutta fario.
Moreover, the nucleic acid molecules may be obtained from the diatoms such as
the genera
Thalassiosira or Phaeodactylum.
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Thus, the term "polynucleotide" as used in accordance with the present
invention further
encompasses variants or derivatives of the aforementioned specific
polynucleotides representing
orthologs, paralogs or other homologs of the polynucleotide of the present
invention. Moreover,
variants or derivatives of the polynucleotide of the present invention also
include artificially
generated muteins. Said muteins include, e.g., enzymes which are generated by
mutagenesis
techniques and which exhibit improved or altered substrate specificity, or
codon optimized
polynucleotides.
Nucleic acid variants or derivatives according to the invention are
polynucleotides which differ
from a given reference polynucleotide by at least one nucleotide substitution,
addition and/or
deletion. If the reference polynucleotide codes for a protein, the function of
this protein is
conserved in the variant or derivative polynucleotide, such that a variant
nucleic acid sequence
shall still encode a polypeptide having a desaturase or elongase activity as
specified above.
Variants or derivatives also encompass polynucleotides comprising a nucleic
acid sequence
which is capable of hybridizing to the aforementioned specific nucleic acid
sequences, preferably,
under stringent hybridization conditions. These stringent conditions are known
to the skilled in the
art and can be found in Current Protocols in Molecular Biology, John Wiley &
Sons, N. Y. (1989),
6.3.1-6.3.6. A preferred example for stringent hybridization conditions are
hybridization conditions
in 6x sodium chloride/sodium citrate (= SSC) at approximately 45 C, followed
by one or more
wash steps in 0.2 xSSC, 0.1% SDS at 50 to 65 C (in particular at 65 C). The
skilled worker knows
that these hybridization conditions differ depending on the type of nucleic
acid and, for example
when organic solvents are present, with regard to the temperature and
concentration of the buffer.
For example, under "standard hybridization conditions" the temperature ranges
depending on the
type of nucleic acid, between 42 C and 58 C in aqueous buffer, with a
concentration of 0.1 to 5X
SSC (pH 7.2). If organic solvent is present in the abovementioned buffer, for
example 50%
formamide, the temperature under standard conditions is approximately 42 C.
The hybridization
conditions for DNA: DNA hybrids are, preferably, 0.1X SSC and 20 C to 45 C,
preferably between
C and 45 C. The hybridization conditions for DNA:RNA hybrids are, preferably,
0.1X SSC and
30 C to 55 C, preferably between 45 C and 55 C. The abovementioned
hybridization
30 temperatures are determined for example for a nucleic acid with
approximately 100 bp (= base
pairs) in length and a G + C content of 50% in the absence of formamide. The
skilled worker
knows how to determine the hybridization conditions required by referring to
textbooks such as
the textbook mentioned above, or the following textbooks: Sambrook et al.,
"Molecular Cloning",
Cold Spring Harbor Laboratory, 1989; Hames and Higgins (Ed.) 1985, "Nucleic
Acids
Hybridization: A Practical Approach", I RL Press at Oxford University Press,
Oxford; Brown (Ed.)
1991, "Essential Molecular Biology: A Practical Approach", I RL Press at
Oxford University Press,
Oxford. In an embodiment, stringent hybridization conditions encompass
hybridization at 65 C in
lx SSC, or at 42 C in lx SSC and 50% formamide, followed by washing at 65 C in
0.3x SSC. In
another embodiment, stringent hybridization conditions encompass hybridization
at 65 C in lx
SSC, or at 42 C in lx SSC and 50% formamide, followed by washing at 65 C in
0.1x SSC.
Alternatively, polynucleotide variants are obtainable by PCR-based techniques
such as mixed
oligonucleotide primer based amplification of DNA, i.e. using degenerated
primers against
conserved domains of the polypeptides of the present invention. Conserved
domains of the
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polypeptide of the present invention may be identified by a sequence
comparison of the nucleic
acid sequences of the polynucleotides or the amino acid sequences of the
polypeptides of the
present invention. As a template, DNA or cDNA from bacteria, fungi, plants, or
animals may be
used. Further, variants include polynucleotides comprising nucleic acid
sequences which are at
least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least
75%, at least 80%, at
least 85%, at least 90%, at least 95%, at least 98% or at least 99% identical
to the nucleic acid
coding sequences shown in any one of the T-DNA sequences given in Table 1 of
the Examples,
and in particular to polynucleotides encoding the desaturases or elongases
referred to above, in
particular the elongases and desaturases given in Table 2. E.g.,
polynucleotides are envisaged
which are at least 50%, at least 55%, at least 60%, at least 65%, at least
70%, at least 75%, at
least 80%, at least 85%, at least 90%, at least 95%, at least 98% or at least
99% identical to the
polynucleotide encoding the delta-4-desaturase from Thraustochytrium sp (and
thus to a
polynucleotide having sequence as shown in nucleotides 26384 to 27943 of SEQ
ID NO: 3). Of
course, a variant as referred to herein must retain the function of the
respective enzyme, e.g. a
variant of a delta-4-desaturase must retain delta-4-desaturase activity, or a
variant of a delta-12-
desaturase must retain delta-12-desaturase activity.
The percent identity values are, preferably, calculated over the entire amino
acid or nucleic acid
sequence region. A series of programs based on a variety of algorithms is
available to the skilled
worker for comparing different sequences. In a preferred embodiment, the
percent identity
between two amino acid sequences is determined using the Needleman and Wunsch
algorithm
(Needleman 1970, J. Mol. Biol. (48):444-453) which has been incorporated into
the needle
program in the EMBOSS software package (EMBOSS: The European Molecular Biology
Open
Software Suite, Rice,P., Longden,I., and Bleasby,A, Trends in Genetics 16(6),
276-277, 2000), a
BLOSUM62 scoring matrix, and a gap opening penalty of 10 and a gap extension
pentalty of 0.5.
Guides for local installation of the EMBOSS package as well as links to WEB-
Services can be
found at http://emboss.sourceforge.net. A preferred, non-limiting example of
parameters to be
used for aligning two amino acid sequences using the needle program are the
default parameters,
including the EBLOSUM62 scoring matrix, a gap opening penalty of 10 and a gap
extension
penalty of 0.5. In yet another preferred embodiment, the percent identity
between two nucleotide
sequences is determined using the needle program in the EMBOSS software
package (EMBOSS:
The European Molecular Biology Open Software Suite, Rice,P., Longden,I., and
Bleasby,A,
Trends in Genetics 16(6), 276-277, 2000), using the EDNAFULL scoring matrix
and a gap
opening penalty of 10 and a gap extension penalty of 0.5. A preferred, non-
limiting example of
parameters to be used in conjunction for aligning two nucleic acid sequences
using the needle
program are the default parameters, including the EDNAFULL scoring matrix, a
gap opening
penalty of 10 and a gap extension penalty of 0.5. The nucleic acid and protein
sequences of the
present invention can further be used as a "query sequence" to perform a
search against public
databases to, for example, identify other family members or related sequences.
Such searches
can be performed using the BLAST series of programs (version 2.2) of Altschul
et al. (Altschul
1990, J. Mol. Biol. 215:403-10). BLAST using desaturase and elongase nucleic
acid sequences
of the invention as query sequence can be performed with the BLASTn, BLASTx or
the tBLASTx
program using default parameters to obtain either nucleotide sequences
(BLASTn, tBLASTx) or
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amino acid sequences (BLASTx) homologous to desaturase and elongase sequences
of the
invention. BLAST using desaturase and elongase protein sequences of the
invention as query
sequence can be performed with the BLASTp or the tBLASTn program using default
parameters
to obtain either amino acid sequences (BLASTp) or nucleic acid sequences
(tBLASTn)
homologous to desaturase and elongase sequences of the invention. To obtain
gapped
alignments for comparison purposes, Gapped BLAST using default parameters can
be utilized as
described in Altschul et al. (Altschul 1997, Nucleic Acids Res. 25(17):3389-
3402).
Preferred variants of the polynucleotides having a sequence shown in SEQ ID
NO: 257, 259, 261,
263, 265, 267, 269, 271, 273, or 275 are described herein below.
Preferably, a variant of a polynucleotide encoding a desaturase or elongase as
referred to herein
is, preferably, a polynucleotide comprising a nucleic acid sequence selected
from the group
consisting of:
a) a nucleic acid sequence being at least 70%, 80%, or 90% identical to the
nucleic acid
sequence having a nucleotide sequence as shown in SEQ ID NOs: 257, 259, 261,
263, 265, 267,
269, 271, 273, or 275,
b) a nucleic acid sequence encoding a polypeptide which is at least 70%,
80, or 90% identical
to a polypeptide having an amino acid sequence as shown in SEQ ID NOs: 258,
260, 262, 264,
266, 268, 270, 272, 274, or 276, and
c) a nucleic acid sequence which is capable of hybridizing under stringent
conditions to i) a
nucleic acid sequence having a nucleotide sequence as shown in SEQ ID NOs:
257, 259, 261,
263, 265, 267, 269, 271, 273, or 275, or to ii) a nucleic acid sequence
encoding a polypeptide
having an amino acid sequence as shown in SEQ ID NOs: 258, 260, 262, 264, 266,
268, 270,
272, 274, or 276.
As set forth above, the polypeptide encoded by said nucleic acid must retain
the function and thus
the activity of the respective enzyme. For example, the polypeptide having a
sequence as shown
in SEQ ID NO: 270 has omega-3-desaturase activity. Accordingly, the variant
this polypeptide
also shall have omega-3-desaturase activity.
Thus, a polynucleotide encoding a desaturase or elongase as referred to herein
is, preferably, a
polynucleotide comprising a nucleic acid sequence selected from the group
consisting of:
a) a nucleic acid sequence having a nucleotide sequence as shown in SEQ ID
NO: 257, 259,
261, 263, 265, 267, 269, 271, 273, or 275,
b) a nucleic acid sequence encoding a polypeptide having an amino acid
sequence as shown
in SEQ ID NO: 258, 260, 262, 264, 266, 268, 270, 272, 274, or 276
c) a nucleic acid sequence being at least 70%, 80%, or 90% identical to the
nucleic acid
sequence having a nucleotide sequence as shown in SEQ ID NOs: 257, 259, 261,
263, 265, 267,
269, 271, 273, or 275,
d) a nucleic acid sequence encoding a polypeptide which is at least 70%,
80, or 90% identical
to a polypeptide having an amino acid sequence as shown in SEQ ID NOs: 258,
260, 262, 264,
266, 268, 270, 272, 274, or 276, and
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e) a nucleic acid sequence which is capable of hybridizing under
stringent conditions to i) a
nucleic acid sequence having a nucleotide sequence as shown in SEQ ID NOs:
257, 259, 261,
263, 265, 267, 269, 271, 273, or 275, or to ii) a nucleic acid sequence
encoding a polypeptide
having an amino acid sequence as shown in SEQ ID NOs: 258, 260, 262, 264, 266,
268, 270,
272, 274, or 276.
The event LBFLFK comprises two T-DNA insertions, the insertions being
designated LBFLFK
Locus 1 and LBFLFK Locus 2. Plants comprising this insertion were generated by
transformation
with the T-DNA vector having a sequence as shown in SEQ ID NO: 3. Sequencing
of the
insertions present in the plant revealed that each locus contained a point
mutation in a coding
sequence resulting in a single amino acid exchange. The mutations did not
affect the function of
the genes. Locus 1 has a point mutation in the coding sequence for the delta-
12 desaturase from
Phythophthora sojae (d12Des(Ps)). The resulting polynucleotide has a sequence
as shown in
SEQ ID NO: 324. Said polynucleotide encodes a polypeptide having a sequence as
shown in
SEQ ID NO: 325. Locus 2 has a point mutation in the coding sequence for the
delta-4 desaturase
from Pavlova lutheri (d4Des(PI)). The resulting polynucleotide has a sequence
as shown in SEQ
ID NO: 326. Said polynucleotide encodes a polypeptide having a sequence as
shown in SEQ ID
NO: 327. The aforementioned polynucleotides are considered as variants of the
polynucleotide
encoding the delta-12 desaturase from Phythophthora sojae and the
polynucleotide encoding the
delta-4 desaturase from Pavlova lutheri. The polynucleotides are considered as
variants and can
be used in the context of the present invention.
A polynucleotide comprising a fragment of any nucleic acid, particularly of
any of the
aforementioned nucleic acid sequences, is also encompassed as a polynucleotide
of the present
invention. The fragments shall encode polypeptides which still have desaturase
or elongase
activity as specified above. Accordingly, the polypeptide may comprise or
consist of the domains
of the polypeptide of the present invention conferring the said biological
activity. A fragment as
meant herein, preferably, comprises at least 50, at least 100, at least 250 or
at least 500
consecutive nucleotides of any one of the aforementioned nucleic acid
sequences or encodes an
amino acid sequence comprising at least 20, at least 30, at least 50, at least
80, at least 100 or
at least 150 consecutive amino acids of any one of the aforementioned amino
acid sequences.
The variant polynucleotides or fragments referred to above, preferably, encode
polypeptides
retaining desaturase or elongase activity to a significant extent, preferably,
at least 10%, at least
20%, at least 30%, at least 40%, at least 50%, at least 60%, at least 70%, at
least 80% or at least
90% of the desaturase or elongase activity exhibited by any of the
polypeptides encoded by T-
DNA given in the accompanying Examples (in particular of the desaturases or
elongases listed in
Table 1 and 2).
In order to express the polynucleotides encoding the desaturases or elongases
as set forth in
connection with the present invention, the polynucleotides shall be operably
linked to expression
control sequences. Preferably, the expression control sequences are
heterologous with respect
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to the polynucleotides operably linked thereto. It is to be understood that
each polynucleotide is
operably linked to an expression control sequence.
The term "expression control sequence" as used herein refers to a nucleic acid
sequence which
is capable of governing, i.e. initiating and controlling, transcription of a
nucleic acid sequence of
interest, in the present case the nucleic sequences recited above. Such a
sequence usually
comprises or consists of a promoter or a combination of a promoter and
enhancer sequences.
Expression of a polynucleotide comprises transcription of the nucleic acid
molecule, preferably,
into a translatable mRNA. Additional regulatory elements may include
transcriptional as well as
translational enhancers. The following promoters and expression control
sequences may be,
preferably, used in an expression vector according to the present invention.
The cos, tac, trp, tet,
trp-tet, Ipp, lac, Ipp-lac, laclq, T7, T5, T3, gal, trc, ara, SP6, A-PR or A-
PL promoters are,
preferably, used in Gram-negative bacteria. For Gram-positive bacteria,
promoters amy and
SPO2 may be used. From yeast or fungal promoters ADC1, A0X1r, GAL1, MFa, AC, P-
60, CYCl,
GAPDH, TEF, rp28, ADH are, preferably, used. For animal cell or organism
expression, the
promoters CMV-, 5V40-, RSV-promoter (Rous sarcoma virus), CMV-enhancer, 5V40-
enhancer
are preferably used. From plants the promoters CaMV/355 (Franck 1980, Cell 21:
285-294],
PRP1 (Ward 1993, Plant. Mol. Biol. 22), SSU, OCS, lib4, usp, STLS1, B33, nos
or the ubiquitin
or phaseolin promoter. Also preferred in this context are inducible promoters,
such as the
promoters described in EP 0388186 Al (i.e. a benzylsulfonamide-inducible
promoter), Gatz 1992,
Plant J. 2:397-404 (i.e. a tetracyclin-inducible promoter), EP 0335528 Al
(i.e. a abscisic-acid-
inducible promoter) or WO 93/21334 (i.e. a ethanol- or cyclohexenol-inducible
promoter). Further
suitable plant promoters are the promoter of cytosolic FBPase or the ST-LSI
promoter from potato
(Stockhaus 1989, EMBO J. 8, 2445), the phosphoribosyl-pyrophosphate
amidotransferase
promoter from Glycine max (Genbank accession No. U87999) or the node-specific
promoter
described in EP 0249676 A1. Particularly preferred are promoters which enable
the expression
in tissues which are involved in the biosynthesis of fatty acids. Also
particularly preferred are
seed-specific promoters such as the USP promoter in accordance with the
practice, but also other
promoters such as the LeB4, DC3, phaseolin or napin promoters. Further
especially preferred
promoters are seed-specific promoters which can be used for monocotyledonous
or
dicotyledonous plants and which are described in US 5,608,152 (napin promoter
from oilseed
rape), WO 98/45461 (oleosin promoter from Arobidopsis, US 5,504,200 (phaseolin
promoter from
Phaseolus vulgaris), WO 91/13980 (Bce4 promoter from Brassica), by Baeumlein
et al., Plant J.,
2, 2, 1992:233-239 (LeB4 promoter from a legume), these promoters being
suitable for dicots.
The following promoters are suitable for monocots: Ipt-2 or Ipt-1 promoter
from barley (WO
95/15389 and WO 95/23230), hordein promoter from barley and other promoters
which are
suitable and which are described in WO 99/16890. In principle, it is possible
to use all natural
promoters together with their regulatory sequences, such as those mentioned
above, for the novel
process. Likewise, it is possible and advantageous to use synthetic promoters,
either additionally
or alone, especially when they mediate a seed-specific expression, such as,
for example, as
described in WO 99/16890. Preferably, the polynucleotides encoding the
desaturases and
elongases as referred to herein are expressed in the seeds of the plants. In a
particular
embodiment, seed-specific promoters are utilized in accordance with the
present invention. In a
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particular preferred embodiment the polynucleotides encoding the desaturares
or elongases are
operably linked to expression control sequences used for the the expression of
the desaturases
and elongases in the Examples section (see e.g. the promoters used for
expressing the elongases
and desaturases in VC-LTM593-1qcz rc. The sequence of this vector is shown in
SEQ ID NO: 3,
see also Table 1 in the Examples section).
The term "operatively linked" as used herein means that the expression control
sequence and the
nucleic acid of interest are linked so that the expression of the said nucleic
acid of interest can be
governed by the said expression control sequence, i.e. the expression control
sequence shall be
functionally linked to the said nucleic acid sequence to be expressed.
Accordingly, the expression
control sequence and, the nucleic acid sequence to be expressed may be
physically linked to
each other, e.g., by inserting the expression control sequence at the 5"end of
the nucleic acid
sequence to be expressed. Alternatively, the expression control sequence and
the nucleic acid
to be expressed may be merely in physical proximity so that the expression
control sequence is
capable of governing the expression of at least one nucleic acid sequence of
interest. The
expression control sequence and the nucleic acid to be expressed are,
preferably, separated by
not more than 500 bp, 300 bp, 100 bp, 80 bp, 60 bp, 40 bp, 20 bp, 10 bp or 5
bp.
Preferred polynucleotides of the present invention comprise, in addition to a
promoter, a
terminator sequence operatively linked to the nucleic acid sequence of
interest. Thereby, an
expression cassette is formed.
The term "terminator" as used herein refers to a nucleic acid sequence which
is capable of
terminating transcription. These sequences will cause dissociation of the
transcription machinery
from the nucleic acid sequence to be transcribed. Preferably, the terminator
shall be active in
plants and, in particular, in plant seeds. Suitable terminators are known in
the art and, preferably,
include polyadenylation signals such as the SV40-poly-A site or the tk-poly-A
site or one of the
plant specific signals indicated in Loke et al. (Loke 2005, Plant Physiol 138,
pp. 1457-1468),
downstream of the nucleic acid sequence to be expressed.
In a preferred embodiment, the polynucleotides encoding the desaturases or
elongase referred
to herein are recombinant.
The invention furthermore relates to recombinant nucleic acid molecules
comprising at least one
nucleic acid sequence which codes for a polypeptide having desaturase and/or
elongase activity
which is modified by comparison with the nucleic acid sequence in the organism
from which the
sequence originates in that it is adapted to the codon usage in one or more
plant species.
For the purposes of the invention "recombinant" means with regard to, for
example, a nucleic acid
sequence, an expression cassette (=gene construct) or a vector comprising the
nucleic acid
sequences used in the process according to the invention or a host cell
transformed with the
nucleic acid sequences, expression cassette or vector used in the process
according to the
invention, all those constructions brought about by recombinant methods in
which either the
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nucleic acid sequence, or a genetic control sequence which is operably linked
with the nucleic
acid sequence, for example a promoter, or are not located in their natural
genetic environment or
have been modified by recombinant methods.
The definitions given herein above preferably apply to the following:
As set forth above, the present invention relates to a method for increasing
the tocopherol content
of a plant relative to a control plant, comprising expressing in a plant at
least one polynucleotide
encoding a delta-12-desaturase, at least one polynucleotide encoding a delta-6-
desaturase, at
least one polynucleotide encoding a delta-6-elongase, and at least one
polynucleotide encoding
a delta-5-desaturase. In an embodiment, the method further comprises the
expression of at least
one polynucleotide encoding an omega-3-desaturase, at least one polynucleotide
encoding a
delta-5-elongase, and/or at least one polynucleotide encoding a delta-4-
desaturase (for more
details regarding the method of the present invention, see section "SUMMARY OF
THE
INVENTION", the definitions and explanations apply accordingly). Preferably,
the polynucleotides
are expressed from expression cassettes.
The invention is also concerned with providing polynucleotides as set forth in
connection with the
method of the present invention, constructs or T-DNAs for establishing high
tocopherol content
in plants or parts thereof, particularly in plant oils.
The construct or T-DNA shall comprise expression cassettes for the
polynucleotides as set forth
in the context of the method of the present invention for increasing the
tocopherol content. The
construct or T-DNA can be used in connection with the method the present
invention. In an
embodiment, said construct or T-DNA is introduced into the plant for
expressing the said
polynucleotides (for increasing the tocopherol content).
Accordingly, the present invention relates to a construct or T-DNA comprising
at least one
expression cassette for a delta-12-desaturase, at least one expression
cassette for a delta-6-
desaturase, at least one expression cassette for a delta-6-elongase, and at
least one expression
cassette for a delta-5-desaturase.
An expression cassette for expression of a gene (herein also referred to as
target gene) shall
comprise the polynucleotide encoding the respective enzyme (i.e. a desaturase
or an elongase)
operatively linked to a promoter (expression control sequence). Preferably,
the expression
cassette further comprises a terminator. Preferably, the terminator is
downstream of the
polynucleotide encoding the desaturase or elongase.
In an embodiment, the construct or T-DNA further comprises at least one
expression cassette for
an omega-3-desaturase.
In an embodiment, the construct or T-DNA further comprises at least one
expression cassette for
a delta-5-elongase.
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In an embodiment, the construct or T-DNA further comprises at least one
expression cassette for
a delta-4-desaturase.
In an embodiment, the construct or T-DNA further comprises at least one
expression cassette for
a delta-15-desaturase.
In a preferred embodiment, the construct or T-DNA further comprises at least
one expression
cassette for an omega-3-desaturase, at least one expression cassette for a
delta-5-elongase, and
at least one expression cassette for a delta-4-desaturase (preferably at least
one for a Coenzyme
A dependent delta-4 desaturase and at least one for a phospholipid dependent
delta-4
desaturase).
In a particularly preferred embodiment, the T-DNA or construct comprises at
least one expression
cassette for a delta-12-desaturase, at least one expression cassette for a
delta-6-desaturase, at
least two expression cassettes for a delta-6-elongase, at least two expression
cassettes for a
delta-5-desaturase, and optionally at least three expression cassettes for an
omega-3-
desaturase, and at least one expression cassette for a delta-5-elongase, and
at least two
expression cassettes for a delta-4-desaturase (preferably for one CoA
(Coenzyme A)-dependent
D4Des and for one Phospholipid-dependent d4Des.)
In another preferred embodiment, the T-DNA or construct comprises at least one
expression
cassette for a delta-6 elongase from Physcomitrella patens, at least one
expression cassette for
a delta-12 desaturase from Phythophthora sojae, at least one expression
cassette for a delta-6
desaturase from Ostreococcus tauri, at least one expression cassette for a
delta-6 elongase from
Thalassiosira pseudonana, at least one expression cassette (in particular at
least two) expression
cassette(s) for a delta-5 desaturase from Thraustochytrium sp., and optionally
at least one
expression cassette (in particular at least two) expression cassette(s) for an
omega-3 desaturase
from Pythium irregulare, at least one expression cassette for an omega-3-
desaturase from
Phythophthora infestans, at least one expression cassette for a delta-5
elongase from
Ostreococcus tauri, and at least one expression cassette for a delta-4
desaturase from
Thraustochytrium sp., and at least one expression cassette fora delta-4
desaturase from Pavlova
lutheri.
Also preferably, the T-DNA or construct comprises the sequence of the T-DNA in
the T-DNA
vector VC-LTM593-1qcz described in the Examples section. This vector comprises
a sequence
shown in SEQ ID NO: 3.
Thus, the invention provides a T-DNA for expression of a target gene in a
plant, wherein the T-
DNA comprises a left and a right border element and at least one expression
cassette comprising
a promoter, operatively linked thereto a target gene, and downstream thereof a
terminator (and
thus at least the expression cassette referred to above), wherein the length
of the T-DNA,
measured from left to right border element and comprising the target gene, has
a length of at
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least 30000 bp. In an embodiment, the expression cassette is separated from
the closest border
of the T-DNA by a separator of at least 500 bp length.
In an embodiment, the T-DNA or construct of the present invention may comprise
a separator
between the expression cassettes encoding for the desaturases or elongases
referred to above.
Preferably, the expression cassettes are separated from each other by a
separator of at least 100
base pairs, preferably of 100 to 200 base pairs. Thus, there is a separator
between each
expression cassette.
The invention thus provides nucleic acids, i.e. polynucleotides. A
polynucleotide according to the
present invention is or comprises a T-DNA or construct according to the
present invention. Thus,
a T-DNA according to the present invention is a polynucleotide, preferably a
DNA, and most
preferably a double stranded DNA. A "T-DNA" according to the invention is a
nucleic acid capable
of eventual integration into the genetic material (genome) of a plant. The
skilled person
understands that for such integration a transformation of respective plant
material is required,
preferred transformation methods and plant generation methods are described
herein.
According to the invention also provided are nucleic acids comprising a T-DNA
or construct as
defined according to the present invention. For example, a T-DNA of the
present invention may
be comprised in a circular nucleic acid, e.g. a plasmid, such that an
additional nucleic acid section
is present between the left and right border elements, i.e. "opposite" of the
expression cassette(s)
according to the present invention. Such circular nucleic acid may be mapped
into a linear form
using an arbitrary starting point, e.g. such that the definition "left border
element ¨ expression
cassette ¨ right border element ¨ additional nucleic acid section opposite of
the expression
cassette" defines the same circular nucleic acid as the definition "expression
cassette ¨ right
border element ¨ additional nucleic acid section opposite of the expression
cassette ¨ left border
element". The additional nucleic acid section preferably comprises one or more
genetic elements
for replication of the total nucleic acid, i.e. the nucleic acid molecule
comprising the T-DNA and
the additional nucleic acid section, in one or more host microorganisms,
preferably in a
microorganism of genus Escherichia, preferably E. coli, and/or Agrobacterium.
Preferable host
microorganisms are described below in more detail. Such circular nucleic acids
comprising a T-
DNA of the present invention are particularly useful as transformation
vectors; such vectors and
are described below in more detail.
The polynucleotides as referred to herein are preferably expressed in a plant
after introducing
them into a plant. Thus, the method of the present invention may also comprise
the step of
introducing the polynucleotides into the plant. Preferably, the
polynucleotides are introduced into
the plant by transformation, in particular by Agrobacterium-mediated
transformation. In an
embodiment, the plants are transformed with a construct or T-DNA comprising
the
polynucleotides and/or expression cassette as set forth in connect with the
present invention.
Thus, it is envisaged that the plant is (has been) transformed with a T-DNA or
construct of the
present invention. The construct or T-DNA used for the introduction,
preferably comprises all
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polynucleotides to be expressed. Thus, a single construct or T-DNA shall be
used for
transformation.
The T-DNA or construct length is, thus, preferably large, i.e. may have a
minimum length of at
least 15000 bp, preferably more than 30000 bp, more preferably at least 40000
bp, even more
preferably at least 50000 bp and most preferably at least 60000 bp.
Preferably, the length of the
T-DNA is in a range of any of the aforementioned minimum lengths to 120000 bp,
more preferably
in a range of any of the aforementioned minimum lengths to 100000 bp, even
more preferably in
a range of any of the aforementioned minimum lengths to 90000 bp, even more
preferably in a
range of any of the aforementioned minimum lengths to 80000 bp. With such
minimum lengths it
is possible to introduce a number of genes in the form of expression cassettes
such that each
individual gene is operably liked to at least one promoter and at least one
terminator.
In an embodiment, in 3' direction of the T-DNA left border element or in 5'
direction of the T-DNA
right border element, a separator is present setting the respective border
element apart from the
expression cassette comprising the target gene. The separator in 3' direction
of the T-DNA left
border element does not necessarily have the same length and/or sequence as
the separator in
5' direction of the T-DNA right border element, as long as both separators
suffice to the further
requirements given below.
In another embodiment, the expression cassettes are separated from each other
by a separator
of at least 100 base pairs, preferably of 100 to 200 base pairs. Thus, there
is a separator between
the expression cassettes.
The separator or spacer is a section of DNA predominantly defined by its
length. Its function is to
separate a target gene from the T-DNA's left or right border, respectively.,
Introducing a separator
effectively separates the gene of interest from major influences exerted by
the neighbouring
genomic locations after insertion of the T-DNA into a genomic DNA. For example
it is commonly
believed that not all genomic loci are equally suitable for expression of a
target gene, and that the
same gene under the control of the same promoter and terminator may be
expressed in different
intensity in plants depending on the region of integration of the target gene
(and its corresponding
promoter and terminator) in the plant genome. It is generally believed that
different regions of a
plant genome are accessible with differing ease for transcription factors
and/or polymerase
enzymes, for example due to these regions being tightly wound around histones
and/or attached
to the chromosomal backbone (cf. for example Deal et al., Curr Opin Plant
Biol. Apr 2011; 14(2):
116-122) or other scaffold material (cf. e.g. Fukuda Y., Plant Mol Biol. 1999
Mar; 39(5): 1051-62).
The mechanism of achieving the above-mentioned benefits by the T-DNA of the
present invention
is not easily understood, so it is convenient to think of the spacer as a
means for physically
providing a buffer to compensate for strain exerted by DNA winding by
neighbouring histones or
chromosomal backbone or other scaffold attached regions. As a model it can be
thought that to
transcribe a target gene, the DNA has to be partially unwound. If neighbouring
regions of the
target gene resist such unwinding, for example because they are tightly wound
around histones
or otherwise attached to a scaffold or backbone such that rotation of nucleic
acid strands is limited,
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the spacer allows to distribute the strain created by the unwinding attempt
over a longer stretch
of nucleic acid, thereby reducing the force required for unwinding at the
target gene.
In an embodiment, the separator has a length of at least 500 bp. The
separator, thus, can be
longer than 500 bp, and preferably is at least 800 bp in length, more
preferably at least 1000 bp.
Longer spacers allow for even more physical separation between the target gene
and the nearest
genomic flanking region.
In another embodiment, the spacer has a length of at least 100 bp. Preferably,
the spacer has a
length of 100 to 200 base pairs.
The separator preferably has a sequence devoid of matrix or scaffold
attachment signals.
Preferably, the separator or spacer does not comprise more than once for a
length of 500 bp,
preferably not more than once for a length of 1000 bp, a 5-tuple which occurs
in the spacers for
20 or more times, summarized over all spacers given in the examples. Those 5-
tuples are, in
increasing frequency in the spacers given in the examples: AGCCT, CGTAA,
CTAAC, CTAGG,
GTGAC, TAGGC, TAGGT, AAAAA, AACGC, TTAGC, ACGCT, GCTGA, ACGTT, AGGCT,
CGTAG, CTACG, GACGT, GCTTA, AGCTT, CGCTA, TGACG, ACGTG, AGCTG, CACGT,
CGTGA, CGTTA, AGCGT, TCACG, CAGCT, CGTCA, CTAGC, GCGTC, TTACG, GTAGC,
TAGCG, TCAGC, TAGCT, AGCTA, GCTAG, ACGTA, TACGT. By reducing the frequency of
occurrence of one or more of the aforelisted 5-tuples compared to the
separators or spacers, a
further increase in expression of a target gene in the T-DNA can be achieved.
The separator may contain a selectable marker. A selectable marker is a
nucleic acid section
whose presence preferably can be verified in seed without having to wait for
the sprouting or full
growth of the plant. Preferably the selectable marker conveys a phenotypical
property to seed or
to a growing plant, for example herbicide tolerance, coloration, seed surface
properties (e.g.
wrinkling), luminescence or fluorescence proteins, for example green
fluorescent protein or
luciferase. If for exhibiting the phenotypical feature an expression of a
marker gene is required,
then the separator correspondingly comprises the marker gene as a selectable
marker, preferably
in the form of an expression cassette. Inclusion of a selectable marker in the
separator is
particularly advantageous since the marker allows easy discard of non-
transformant plant
material. Also, in such unexpected case where the T-DNA integrates in a
location of the plant
genome where the length and/or nucleobase composition of the spacer is
insufficient to overcome
gene silencing effects caused by the neighbouring genomic DNA, the selectable
marker allows
easy discard of such unfortunately badly performing exceptional transformants.
Thus, preferably
the separator comprises an expression cassette for expression of an herbicide
tolerance gene.
Such separator greatly reduces the chance of having to cultivate a
transformant where silencing
effects are so strong that even the expression of the selectable marker gene
is greatly reduced
or fully inhibited. According to the invention, the separator preferably does
not comprise a
desaturase or elongase gene, and also preferably does not comprise a promoter
or operatively
linked to a desaturase or elongase gene. Thus, the T-DNA of the present
invention in preferred
embodiments is useful for effective separation of the desaturase and elongase
genes essential
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for the production of VLC-PUFAs from any influence of effects caused by
neighbouring genomic
plant DNA.
For increasing the tocopherol content (and for the production of VLC-PUFAs) in
plants, the
invention also provides a construct or a T-DNA comprising the coding sequences
(in particular of
the desaturases and elogases) as given in Table 1 and 2 in the examples,
preferably comprising
the coding sequences (in particular of the desaturases and elogases) and and
promoters as given
in Table 1 in the examples, more preferably the coding sequences (in
particular of the desaturases
and elongases) and promoters and terminators as given in Table 1 in the
examples, and most
preferably the expression cassettes for the desaturases and elongases as
referred to in the
context of the method of present invention as present in VC-LTM593-1qcz rc
(see Examples
section, SEQ ID NO: 3).
The present invention furthermore relates to a plant comprising the
polynucleotides as referred
to herein in the context of the method of the present invention for increasing
the tocopherol
content, or the T-DNA or construct of the present invention. Furthermore, the
present invention
relates to a seed of the plant. Said seed shall comprised the said
polynucleotides. In an
embodiment, the said polynucleotides are comprised by the same T-DNA.
In addition, the present invention relates to Brassica plant, or a seed
thereof, having in increased
tocopherol content a compared to a control plant, in particular having an
increased tocopherol
content the seeds as compared to the seeds of control plants. In an
embodiment, said plant is a
Brassica napus plant. Said plant shall be transgenic.
In a preferred embodiment, the seed of the present invention shall comprise an
oil as described
herein below in more detail.
The plant of the invention shall comprise one or more T-DNA or construct of
the present invention.
Thus, the plant shall comprise at least T-DNA or construct of the present
invention. Moreover, it
is envisaged that the plant of the present invention comprises the
polynucleotides encoding
desaturases as set forth in the context of the method of the present invention
of increasing the
tocopherol content.
Preferably, the T-DNA or construct comprised by the plant comprises one or
more expression
cassettes encoding for one or more d6Des (delta 6 desaturase), one or more
d6Elo (delta 6
elongase), one or more d5Des (delta 5 desaturase), or one more d12Des (delta
12 desaturase).
In an embodiment, the T-DNA or construct comprised by the plant of the present
invention, further
comprises expression cassettes for one or more o3Des (omega 3 desaturase), one
or more d5Elo
(delta 5 elongase) and/or one or more d4Des (delta 4 desaturase), preferably
for at least one CoA
(Coenzyme A)-dependent D4Des and one Phospholipid-dependent d4Des.
Three desaturase genes are particularly prone to gene dosage effects (also
called "copy number
effects"), such that increasing the number of expression cassettes comprising
these respective
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genes leads to a stronger increase in VLC-PUFA levels in plant oils than
increasing the number
of expression cassettes of other genes. These genes are the genes coding for
delta-12-
desaturase activity, for delta-6-desaturase activity and omega-3-desaturase
activity. It is to be
understood that where the T-DNA of the present invention comprises more than
one expression
cassette comprising a gene of the same function, these genes do not need to be
identical
concerning their nucleic acid sequence or the polypeptide sequence encoded
thereby, but should
be functional homologs. Thus, for example, to make use of the gene dosage
effect described
herein a T-DNA according to the present invention may comprise, in addition to
optionally a
multiplicity of genes coding for delta-6-desaturases and/or omega-3-
desaturases, two, three, four
or more expression cassettes each comprising a gene coding fora delta-12-
desaturase, wherein
the delta-12-desaturase polypeptides coded by the respective genes differ in
their amino acid
sequence. Likewise, a T-DNA of the present invention may comprise, in addition
to optionally a
multiplicity of genes coding for delta-12-desaturases and/or omega-3-
desaturases, two, three,
four or more expression cassettes each comprising a gene coding for a delta-6-
desaturase,
wherein the delta-6-desaturase polypeptides coded by the respective genes
differ in their amino
acid sequence, or a T-DNA of the present invention may comprise, in addition
to optionally a
multiplicity of genes coding for delta-12-desaturases and/or delta-6-
desaturases, two, three, four
or more expression cassettes each comprising a gene coding for a omega-3-
desaturase, wherein
the omega-3-desaturase polypeptides coded by the respective genes differ in
their amino acid
sequence.
According to the invention, the T-DNA, construct or plant may also comprise,
instead of one or
more of the aforementioned coding sequences, a functional homolog thereof. A
functional
homolog of a coding sequence is a sequence coding for a polypeptide having the
same metabolic
function as the replaced coding sequence. For example, a functional homolog of
a delta-5-
desaturase would be another delta-5-desaturase, and a functional homolog of a
delta-5-elongase
would be another delta-5-elongase. The functional homolog of a coding sequence
preferably
codes for a polypeptide having at least 40% sequence identity to the
polypeptide coded for by the
corresponding coding sequence given Table 1 of the examples, more preferably
at least 41%,
more preferably at least 46%, more preferably at least 48%, more preferably at
least 56%, more
preferably at least 58%, more preferably at least 59%, more preferably at
least 62%, more
preferably at least 66%, more preferably at least 69%, more preferably at
least 73%, more
preferably at least 75%, more preferably at least 77%, more preferably at
least 81%, more
preferably at least 84%, more preferably at least 87%, more preferably at
least 90%, more
preferably at least 92%, more preferably at least 95%, more preferably at
least 96%, more
preferably at least 97%, more preferably at least 98% and even more preferably
at least 99%.
Likewise, a functional homolog of a promoter is a sequence for starting
transcription of a coding
sequence located within 500 bp for a proximal promoter or, for a distal
promoter, within 3000 bp
distant from the promoter TATA box closest to the coding sequence. Again, a
functional homolog
of a plant seed specific promoter is another plant seed specific promoter. The
functional homolog
of a terminator, correspondingly, is a sequence for ending transcription of a
nucleic acid
sequence.
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The Examples describe a particularly preferred T-DNA sequence. The skilled
person understands
that the coding sequences, promoters and terminators described therein can be
replaced by their
functional homologs. However, the Examples also describe that according to the
invention,
certain combinations of promoters and coding sequences, or certain
combinations of promoters
driving the expression of their corresponding coding sequences, or certain
coding sequences or
combinations thereof are particularly advantageous; such combinations or
individual coding
sequences should according to the invention not be replaced by functional
homologs of the
respective element (here: coding sequence or promoter). Preferred promoter-
coding sequence-
terminator combinations are shown in Table 1.
A T-DNA or construct of the present invention may comprise two or more genes,
preferably all
genes, susceptible to a gene dosage effect. As described herein, it is
advantageous for achieving
high conversion efficiencies of certain enzymatic acitvities, e.g. delta-12-
desaturase, delta-6-
desaturase and/or omega-3-desaturase activity, to introduce more than one gene
coding for an
enzyme having the desired activity into a plant cell. When introducing T-DNA
into plant cells,
generally transformation methods involving exposition of plant cells to
microorganisms are
employed, e.g. as described herein. As each microorganism may comprise more
than one nucleic
acid comprising a T-DNA of the present invention, recombinant plant cells are
frequently obtained
comprising two or more T-DNAs of the present invention independently
integrated into the cell's
genetic material. Thus, by combining genes susceptible to a gene dosage effect
on one construct
for transformation allows to easily exploit the independence of
transformations to achieve a higher
frequency of multiple insertions of such T-DNAs. This is particularly useful
for transformation
methods relying on co-transformation to keep the size of each construct to be
transformed low.
The invention accordingly also provides a construct comprising a T-DNA
according to the present
invention, wherein the construct preferably is a vector for transformation of
a plant cell by
microorganism-mediated transformation, preferably by Agrobacterium-mediated
transformation.
Correspondingly, the invention also provides a transforming microorganism
comprising one T-
DNA according to the present invention, preferably as a construct comprising
said T-DNA.
Preferably the microorganism is of genus Agrobacterium, preferably a disarmed
strain thereof,
and preferably of species Agrobacterium tumefaciens or, even more preferably,
of species
Agrobacterium rhizogenes. Corresponding strains are for example described in
W006024509A2,
and methods for plant transformation using such microorganisms are for example
described in
W013014585A1. These WO publications are incorporated herein in their entirety,
because they
contain valuable information about the creation, selection and use of such
microorganisms.
The term "vector", preferably, encompasses phage, plasmid, viral vectors as
well as artificial
chromosomes, such as bacterial or yeast artificial chromosomes. Moreover, the
term also relates
to targeting constructs which allow for random or site-directed integration of
the targeting
construct into genomic DNA. Such target constructs, preferably, comprise DNA
of sufficient length
for either homolgous or heterologous recombination as described in detail
below. The vector
encompassing the polynucleotide of the present invention, preferably, further
comprises
selectable markers for propagation and/or selection in a host. The vector may
be incorporated
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into a host cell by various techniques well known in the art. If introduced
into a host cell, the vector
may reside in the cytoplasm or may be incorporated into the genome. In the
latter case, it is to be
understood that the vector may further comprise nucleic acid sequences which
allow for
homologous recombination or heterologous insertion. Vectors can be introduced
into prokaryotic
or eukaryotic cells via conventional transformation or transfection
techniques. The terms
"transformation" and "transfection", conjugation and transduction, as used in
the present context,
are intended to comprise a multiplicity of prior-art processes for introducing
foreign nucleic acid
(for example DNA) into a host cell, including calcium phosphate, rubidium
chloride or calcium
chloride co-precipitation, DEAE-dextran-mediated transfection, lipofection,
natural competence,
carbon-based clusters, chemically mediated transfer, electroporation or
particle bombardment.
Suitable methods for the transformation or transfection of host cells,
including plant cells, can be
found in Sambrook et al. (Molecular Cloning: A Laboratory Manual, 2nd ed.,
Cold Spring Harbor
Laboratory, Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY, 1989)
and other
laboratory manuals, such as Methods in Molecular Biology, 1995, Vol. 44,
Agrobacterium
protocols, Ed.: Gartland and Davey, Humana Press, Totowa, New Jersey.
Alternatively, a plasmid
vector may be introduced by heat shock or electroporation techniques. Should
the vector be a
virus, it may be packaged in vitro using an appropriate packaging cell line
prior to application to
host cells.
Preferably, the vector referred to herein is suitable as a cloning vector,
i.e. replicable in microbial
systems. Such vectors ensure efficient cloning in bacteria and, preferably,
yeasts or fungi and
make possible the stable transformation of plants. Those which must be
mentioned are, in
particular, various binary and co-integrated vector systems which are suitable
for the T DNA-
mediated transformation. Such vector systems are, as a rule, characterized in
that they contain
at least the vir genes, which are required for the Agrobacterium-mediated
transformation, and the
sequences which delimit the T-DNA (T-DNA border). These vector systems,
preferably, also
comprise further cis-regulatory regions such as promoters and terminators
and/or selection
markers with which suitable transformed host cells or organisms can be
identified. While co-
integrated vector systems have vir genes and T-DNA sequences arranged on the
same vector,
binary systems are based on at least two vectors, one of which bears vir
genes, but no T-DNA,
while a second one bears T-DNA, but no vir gene. As a consequence, the last-
mentioned vectors
are relatively small, easy to manipulate and can be replicated both in E. coli
and in Agrobacterium.
These binary vectors include vectors from the pBIB-HYG, pPZP, pBecks, pGreen
series.
Preferably used in accordance with the invention are Bin19, pB1101, pBinAR,
pGPTV and
pCAMBIA. An overview of binary vectors and their use can be found in Heliens
et al, Trends in
Plant Science (2000) 5, 446-451. Furthermore, by using appropriate cloning
vectors, the
polynucleotides can be introduced into host cells or organisms such as plants
or animals and,
thus, be used in the transformation of plants, such as those which are
published, and cited, in:
Plant Molecular Biology and Biotechnology (CRC Press, Boca Raton, Florida),
chapter 6/7, pp.
71-119 (1993); F.F. White, Vectors for Gene Transfer in Higher Plants; in:
Transgenic Plants, vol.
1, Engineering and Utilization, Ed.: Kung and R. Wu, Academic Press, 1993, 15-
38; B. Jenes et
al., Techniques for Gene Transfer, in: Transgenic Plants, vol. 1, Engineering
and Utilization, Ed.:
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Kung and R. Wu, Academic Press (1993), 128-143; Potrykus 1991, Annu. Rev.
Plant Physiol.
Plant Molec. Biol. 42, 205-225.
More preferably, the vector of the present invention is an expression vector.
In such an expression
vector, i.e. a vector which comprises the polynucleotide of the invention
having the nucleic acid
sequence operatively linked to an expression control sequence (also called
"expression
cassette") allowing expression in plant cells or isolated fractions thereof.
Most important, the invention also provides a plant or seed thereof,
comprising, integrated in its
genome, a construct or T-DNA of the present invention.
Thus, the construct or T-DNA shall be stably integrated into the genome of the
plant or plant cell.
The present invention, thus, relates to a plant comprising the T-DNA or
construct of the present
invention.
Such T-DNA or construct preferably allows for the expression of all genes
required for increasing
the tocopherol content in plants and particularly in the seeds thereof,
particularly in oilseed plants,
and most beneficially in plants or seeds of family Brassicaceae, preferably of
genus Brassica and
most preferably of a species comprising a genome of one or two members of the
species Brassica
oleracea, Brassica nigra and Brassica rapa, thus preferably of the species
Brassica napus,
Brassica carinata, Brassica juncea, Brassica oleracea, Brassica nigra or
Brassica rapa.
Particularly preferred according to the invention are plants and seeds of the
species Brassica
napus and Brassica carinata.
The plants of the present invention are necessarily transgenic, i.e. they
comprise genetic material
not present in corresponding wild type plant or arranged differently in
corresponding wild type
plant, for example differing in the number of genetic elements. For example,
the plants of the
present invention comprise promoters also found in wild type plants, but the
plants of the present
invention comprise such promoter operatively linked to a coding sequence sucht
that this
combination of promoter and coding sequence is not found in the corresponding
wild type plant.
Accordingly, the the polynucleotide encoding for the desaturases or elongases
shall be
recombinant polynucleotides.
The plants and seeds of the present invention differ from hitherto produced
plants in their
production of a high content of tocopherol (and preferably of VLC-PUFAs), see
Examples. In
particular, the combinations of polynucleotides encoding the elongases or
desaturases as set
forth in connection with the method of the present invention, the constructs
and T-DNAs of the
present invention allow for the generation of transformant plants (also called
"recombinant plants")
and seeds thereof with a high transformation frequency, with a high stability
of T-DNA insertions
over multiple generations of self-fertilized plants, unchanged or unimpaired
phenotypical and
agronomic characteristics, with high amounts and concentration of tocopherol,
and with high
amounts and concentration of VLC-PUFAs, particularly EPA and/or DHA, in the
oil of populations
of such transformed plants and their corresponding progeny.
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Unless stated otherwise, a plant of the present invention comprising a T-DNA
or construct of the
present invention can also be a plant comprising a part of a T-DNA or
construct of the present
invention, where such part is sufficient for the production of a desaturase
and/or elongase coded
for in the corresponding full T-DNA or construct of the present invention.
Such plants most
preferably comprise at least one full T-DNA of the present invention in
addition to the part of a T-
DNA of the present invention as defined in the previous sentence. Such plants
are hereinafter
also termed "partial double copy" plants. Event LBFDAU is an example of a
plant comprising a
part of a T-DNA of the present invention, and still being a plant of the
present invention. In one
embodiment the T_DNA is a full T-DNA.
Preferred plants of the present invention comprise one or more T-DNA(s) or
construct(s) of the
present invention comprising expression cassettes comprising, one or more
genes encoding for
one or more d5Des, one or more d6Elo, one or more d6Des, and one or more
d12Des. In one
embodiment, at least one T-DNA or vector further comprises (an) expression
cassette(s) which
comprises one or more genes encoding for one or more d5Elo, one or more o3Des,
one or more
d15Des, and/or one or more D4Des, preferably for at least one CoA-dependent
D4Des and one
Phospholipid-dependent d4Des. In one embodiment, the T-DNA or T-DNAs comprise
one or
more expression cassettes encoding d6Elo(Tp_GA) and/or d6Elo(Pp_GA).
d6Elo(Tp_GA) is a
Delta-6 elongase from Thalassiosira pseudonana, d6Elo(Pp_GA) is a Delta-6
elongase from
Physcomitrella patens.
Preferably, the plant (or plant cell) of the present invention is an oilseed
crop plant (or an oilseed
crop plant cell). More preferably, said oilseed crop is selected from the
group consisting of flax
(Linum sp.), rapeseed (Brassica sp.), soybean (Glycine and Soja sp.),
sunflower (Helianthus sp.),
cotton (Gossypium sp.), corn (Zea mays), olive (Olea sp.), safflower
(Carthamus sp.), cocoa
(Theobroma cacoa), peanut (Arachis sp.), hemp, camelina, crambe, oil palm,
coconuts,
groundnuts, sesame seed, castor bean, lesquerella, tallow tree, sheanuts,
tungnuts, kapok fruit,
poppy seed, jojoba seeds and perilla. Preferred plants to be used for
introducing the
polynucleotide or T-DNA of the invention are plants which are capable of
synthesizing fatty acids,
such as all dicotyledonous or monocotyledonous plants, algae or mosses.
Preferred plants are
selected from the group of the plant families Adelotheciaceae, Anacardiaceae,
Arecaceae,
Asteraceae, Apiaceae, Betulaceae, Boraginaceae, Brassicaceae, Bromeliaceae,
Caricaceae,
Cannabaceae, Convolvulaceae, Chenopodiaceae, Compositae, Crypthecodiniaceae,
Cruciferae,
Cucurbitaceae, Ditrichaceae, Elaeagnaceae, Ericaceae, Euphorbiaceae, Fabaceae,
Geraniaceae, Gramineae, Juglandaceae, Lauraceae, Leguminosae, Linaceae,
Malvaceae,
Moringaceae, Marchantiaceae, Onagraceae, Olacaceae, Oleaceae, Papaveraceae,
Piperaceae,
Pedaliaceae, Poaceae, Solanaceae, Prasinophyceae or vegetable plants or
ornamentals such as
Tagetes. Examples which may be mentioned are the following plants selected
from the group
consisting of: Adelotheciaceae such as the genera Physcomitrella, such as the
genus and species
Physcomitrella patens, Anacardiaceae such as the genera Pistacia, Mangifera,
Anacardium, for
example the genus and species Pistacia vera [pistachio], Mangifer indica
[mango] or Anacardium
occidentale [cashew], Asteraceae, such as the genera Calendula, Carthamus,
Centaurea,
Cichorium, Cynara, Helianthus, Lactuca, Locusta, Tagetes, Valeriana, for
example the genus and
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species Calendula officinalis [common marigold], Carthamus tinctorius
[safflower], Centaurea
cyanus [cornflower], Cichorium intybus [chicory], Cynara scolymus [artichoke],
Helianthus annus
[sunflower], Lactuca sativa, Lactuca crispa, Lactuca esculenta, Lactuca
scariola L. ssp. sativa,
Lactuca scariola L. var. integrata, Lactuca scariola L. var. integrifolia,
Lactuca sativa subsp.
romana, Locusta communis, Valeriana locusta [salad vegetables], Tagetes
lucida, Tagetes erecta
or Tagetes tenuifolia [african or french marigold], Apiaceae, such as the
genus Daucus, for
example the genus and species Daucus carota [carrot], Betulaceae, such as the
genus Corylus,
for example the genera and species Corylus avellana or Corylus colurna
[hazelnut],
Boraginaceae, such as the genus Borago, for example the genus and species
Borago officinalis
[borage], Brassicaceae, such as the genera Brassica, Melanosinapis, Sinapis,
Arabadopsis, for
example the genera and species Brassica napus, Brassica rapa ssp. [oilseed
rape], Sinapis
arvensis Brassica juncea, Brassica juncea var. juncea, Brassica juncea var.
crispifolia, Brassica
juncea var. foliosa, Brassica nigra, Brassica sinapioides, Melanosinapis
communis [mustard],
Brassica oleracea [fodder beet] or Arabidopsis thaliana, Bromeliaceae, such as
the genera
Anana, Bromelia (pineapple), for example the genera and species Anana comosus,
Ananas
ananas or Bromelia comosa [pineapple], Caricaceae, such as the genus Carica,
such as the
genus and species Carica papaya [pawpaw], Cannabaceae, such as the genus
Cannabis, such
as the genus and species Cannabis sativa [hemp], Convolvulaceae, such as the
genera lpomea,
Convolvulus, for example the genera and species lpomoea batatus, lpomoea
pandurata,
Convolvulus batatas, Convolvulus tiliaceus, lpomoea fastigiata, lpomoea
tiliacea, lpomoea triloba
or Convolvulus panduratus [sweet potato, batate], Chenopodiaceae, such as the
genus Beta,
such as the genera and species Beta vulgaris, Beta vulgaris var. altissima,
Beta vulgaris
var.Vulgaris, Beta maritima, Beta vulgaris var. perennis, Beta vulgaris var.
conditiva or Beta
vulgaris var. esculenta [sugarbeet], Crypthecodiniaceae, such as the genus
Crypthecodinium, for
example the genus and species Cryptecodinium cohnii, Cucurbitaceae, such as
the genus
Cucurbita, for example the genera and species Cucurbita maxima, Cucurbita
mixta, Cucurbita
pepo or Cucurbita moschata [pumpkin/squash], Cymbellaceae such as the genera
Amphora,
Cymbella, Okedenia, Phaeodactylum, Reimeria, for example the genus and species
Phaeodactylum tricornutum, Ditrichaceae such as the genera Ditrichaceae,
Astomiopsis,
Ceratodon, Chrysoblastella, Ditrichum, Distichium, Eccremidium, Lophidion,
Philibertiella,
Pleuridium, Saelania, Trichodon, Skottsbergia, for example the genera and
species Ceratodon
antarcticus, Ceratodon columbiae, Ceratodon heterophyllus, Ceratodon
purpureus, Ceratodon
purpureus, Ceratodon purpureus ssp. convolutus, Ceratodon, purpureus spp.
stenocarpus,
Ceratodon purpureus var. rotund ifolius, Ceratodon ratodon, Ceratodon
stenocarpus,
Chrysoblastella chilensis, Ditrichum ambiguum, Ditrichum brevisetum, Ditrichum
crispatissimum,
Ditrichum difficile, Ditrichum falcifolium, Ditrichum flexicaule, Ditrichum
giganteum, Ditrichum
heteromallum, Ditrichum lineare, Ditrichum lineare, Ditrichum montanum,
Ditrichum montanum,
Ditrichum pallidum, Ditrichum punctulatum, Ditrichum pusillum, Ditrichum
pusillum var. tortile,
Ditrichum rhynchostegium, Ditrichum schimperi, Ditrichum tortile, Distichium
capillaceum,
Distichium hagenii, Distichium inclinatum, Distichium macounii, Eccremidium
floridanum,
Eccremidium whiteleggei, Lophidion strictus, Pleuridium acuminatum, Pleuridium
alternifolium,
Pleuridium holdridgei, Pleuridium mexicanum, Pleuridium ravenelii, Pleuridium
subulatum,
Saelania glaucescens, Trichodon borealis, Trichodon cylindricus or Trichodon
cylindricus var.
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oblongus, Elaeagnaceae such as the genus Elaeagnus, for example the genus and
species Olea
europaea [olive], Ericaceae such as the genus Kalmia, for example the genera
and species
Kalmia latifolia, Kalmia angustifolia, Kalmia microphylla, Kalmia polifolia,
Kalmia occidentalis,
Cistus chamaerhodendros or Kalmia lucida [mountain laurel], Euphorbiaceae such
as the genera
Manihot, Janipha, Jatropha, Ricinus, for example the genera and species
Manihot utilissima,
Janipha manihot, Jatropha manihot, Manihot aipil, Manihot dulcis, Manihot
manihot, Manihot
melanobasis, Manihot esculenta [manihot] or Ricinus communis [castor-oil
plant], Fabaceae such
as the genera Pisum, Albizia, Cathormion, Feuillea, lnga, Pithecolobium,
Acacia, Mimosa,
Medicajo, Glycine, Dolichos, Phaseolus, Soja, for example the genera and
species Pisum
sativum, Pisum arvense, Pisum humile [pea], Albizia berteriana, Albizia
julibrissin, Albizia
lebbeck, Acacia berteriana, Acacia littoralis, Albizia berteriana, Albizzia
berteriana, Cathormion
berteriana, Feuillea berteriana, lnga fragrans, Pithecellobium berterianum,
Pithecellobium
fragrans, Pithecolobium berterianum, Pseudalbizzia berteriana, Acacia
julibrissin, Acacia nemu,
Albizia nemu, Feuilleea julibrissin, Mimosa julibrissin, Mimosa speciosa,
Sericanrda julibrissin,
Acacia lebbeck, Acacia macrophylla, Albizia lebbek, Feuilleea lebbeck, Mimosa
lebbeck, Mimosa
speciosa [silk tree], Medicago sativa, Medicago falcata, Medicago varia
[alfalfa], Glycine max
Dolichos soja, Glycine gracilis, Glycine hispida, Phaseolus max, Soja hispida
or Soja max
[soybean], Funariaceae such as the genera Aphanorrhegma, Entosthodon, Funaria,
Physcomitrella, Physcomitrium, for example the genera and species
Aphanorrhegma serratum,
Entosthodon attenuatus, Entosthodon bolanderi, Entosthodon bonplandii,
Entosthodon
californicus, Entosthodon drummondii, Entosthodon jamesonii, Entosthodon
leibergii,
Entosthodon neoscoticus, Entosthodon rubrisetus, Entosthodon spathulifolius,
Entosthodon
tucsoni, Funaria americana, Funaria bolanderi, Funaria calcarea, Funaria
californica, Funaria
calvescens, Funaria convoluta, Funaria flavicans, Funaria groutiana, Funaria
hygrometrica,
Funaria hygrometrica var. arctica, Funaria hygrometrica var. calvescens,
Funaria hygrometrica
var. convoluta, Funaria hygrometrica var. muralis, Funaria hygrometrica var.
utahensis, Funaria
microstoma, Funaria microstoma var. obtusifolia, Funaria muhlenbergii, Funaria
orcuttii, Funaria
plano-convexa, Funaria polaris, Funaria ravenelii, Funaria rubriseta, Funaria
serrata, Funaria
sonorae, Funaria sublimbatus, Funaria tucsoni, Physcomitrella californica,
Physcomitrella patens,
Physcomitrella readeri, Physcomitrium australe, Physcomitrium californicum,
Physcomitrium
collenchymatum, Physcomitrium coloradense, Physcomitrium cupuliferum,
Physcomitrium
drummondii, Physcomitrium eurystomum, Physcomitrium flexifolium, Physcomitrium
hookeri,
Physcomitrium hookeri var. serratum, Physcomitrium immersum, Physcomitrium
kellermanii,
Physcomitrium megalocarpum, Physcomitrium pyriforme, Physcomitrium pyriforme
var.
serratum, Physcomitrium rufipes, Physcomitrium sandbergii, Physcomitrium
subsphaericum,
Physcomitrium washingtoniense, Geraniaceae, such as the genera Pelargonium,
Cocos, Oleum,
for example the genera and species Cocos nucifera, Pelargonium grossularioides
or Oleum
cocois [coconut], Gramineae, such as the genus Saccharum, for example the
genus and species
Saccharum officinarum, Juglandaceae, such as the genera Juglans, Wallia, for
example the
genera and species Juglans regia, Juglans ailanthifolia, Juglans sieboldiana,
Juglans cinerea,
Wallia cinerea, Juglans bixbyi, Juglans californica, Juglans hindsii, Juglans
intermedia, Juglans
jamaicensis, Juglans major, Juglans microcarpa, Juglans nigra or Wallia nigra
[walnut],
Lauraceae, such as the genera Persea, Laurus, for example the genera and
species Laurus
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nobilis [bay], Persea americana, Persea gratissima or Persea persea [avocado],
Leguminosae,
such as the genus Arachis, for example the genus and species Arachis hypogaea
[peanut],
Linaceae, such as the genera Linum, Adenolinum, for example the genera and
species Linum
usitatissimum, Linum humile, Linum austriacum, Linum bienne, Linum
angustifolium, Linum
catharticum, Linum flavum, Linum grandiflorum, Adenolinum grandiflorum, Linum
lewisii, Linum
narbonense, Linum perenne, Linum perenne var. lewisii, Linum pratense or Linum
trigynum
[linseed], Lythrarieae, such as the genus Punica, for example the genus and
species Punica
granatum [pomegranate], Malvaceae, such as the genus Gossypium, for example
the genera and
species Gossypium hirsutum, Gossypium arboreum, Gossypium barbadense,
Gossypium
herbaceum or Gossypium thurberi [cotton], Marchantiaceae, such as the genus
Marchantia, for
example the genera and species Marchantia berteroana, Marchantia foliacea,
Marchantia
macropora, Musaceae, such as the genus Musa, for example the genera and
species Musa nana,
Musa acuminata, Musa paradisiaca, Musa spp. [banana], Onagraceae, such as the
genera
Camissonia, Oenothera, for example the genera and species Oenothera biennis or
Camissonia
brevipes [evening primrose], Palmae, such as the genus Elacis, for example the
genus and
species Elaeis guineensis [oil palm], Papaveraceae, such as the genus Papaver,
for example the
genera and species Papaver orientale, Papaver rhoeas, Papaver dubium [poppy],
Pedaliaceae,
such as the genus Sesamum, for example the genus and species Sesamum indicum
[sesame],
Piperaceae, such as the genera Piper, Artanthe, Peperomia, Steffensia, for
example the genera
and species Piper aduncum, Piper amalago, Piper angustifolium, Piper auritum,
Piper betel, Piper
cubeba, Piper longum, Piper nigrum, Piper retrofractum, Artanthe adunca,
Artanthe elongata,
Peperomia elongata, Piper elongatum, Steffensia elongata [cayenne pepper],
Poaceae, such as
the genera Hordeum, Secale, Avena, Sorghum, Andropogon, Holcus, Panicum,
Oryza, Zea
(maize), Triticum, for example the genera and species Hordeum vulgare, Hordeum
jubatum,
Hordeum murinum, Hordeum secalinum, Hordeum distichon, Hordeum aegiceras,
Hordeum
hexastichon, Hordeum hexastichum, Hordeum irregulare, Hordeum sativum, Hordeum
secalinum
[barley], Secale cereale [rye], Avena sativa, Avena fatua, Avena byzantina,
Avena fatua var.
sativa, Avena hybrida [oats], Sorghum bicolor, Sorghum halepense, Sorghum
saccharatum,
Sorghum vulgare, Andropogon drummondii, Holcus bicolor, Holcus sorghum,
Sorghum
aethiopicum, Sorghum arundinaceum, Sorghum caffrorum, Sorghum cernuum, Sorghum
dochna,
Sorghum drummondii, Sorghum durra, Sorghum guineense, Sorghum lanceolatum,
Sorghum
nervosum, Sorghum saccharatum, Sorghum subglabrescens, Sorghum
verticilliflorum, Sorghum
vulgare, Holcus halepensis, Sorghum miliaceum, Panicum militaceum [millet],
Oryza sativa,
Oryza latifolia [rice], Zea mays [maize], Triticum aestivum, Triticum durum,
Triticum turgidum,
Triticum hybernum, Triticum macha, Triticum sativum or Triticum vulgare
[wheat],
Porphyridiaceae, such as the genera Chroothece, Flintiella, Petrovanella,
Porphyridium,
RhodeIla, Rhodosorus, Vanhoeffenia, for example the genus and species
Porphyridium
cruentum, Proteaceae, such as the genus Macadamia, for example the genus and
species
Macadamia intergrifolia [macadamia], Prasinophyceae such as the genera
Nephroselmis,
Prasinococcus, Scherffelia, Tetraselmis, Mantoniella, Ostreococcus, for
example the genera and
species Nephroselmis olivacea, Prasinococcus capsulatus, Scherffelia dubia,
Tetraselmis chui,
Tetraselmis suecica, Mantoniella squamata, Ostreococcus tauri, Rubiaceae such
as the genus
Cofea, for example the genera and species Cofea spp., Coffea arabica, Coffea
canephora or
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Coffea liberica [coffee], Scrophulariaceae such as the genus Verbascum, for
example the genera
and species Verbascum blattaria, Verbascum chaixii, Verbascum densiflorum,
Verbascum
lagurus, Verbascum longifolium, Verbascum lychnitis, Verbascum nigrum,
Verbascum
olympicum, Verbascum phlomoides, Verbascum phoenicum, Verbascum pulverulentum
or
Verbascum thapsus [mullein], Solanaceae such as the genera Capsicum,
Nicotiana, Solanum,
Lycopersicon, for example the genera and species Capsicum annuum, Capsicum
annuum var.
glabriusculum, Capsicum frutescens [pepper], Capsicum annuum [paprika],
Nicotiana tabacum,
Nicotiana alata, Nicotiana attenuata, Nicotiana glauca, Nicotiana
langsdorffii, Nicotiana
obtusifolia, Nicotiana quadrivalvis, Nicotiana repanda, Nicotiana rustica,
Nicotiana sylvestris
[tobacco], Solanum tuberosum [potato], Solanum melongena [eggplant],
Lycopersicon
esculentum, Lycopersicon lycopersicum, Lycopersicon pyriforme, Solanum
integrifolium or
Solanum lycopersicum [tomato], Sterculiaceae, such as the genus Theobroma, for
example the
genus and species Theobroma cacao [cacao] or Theaceae, such as the genus
Camellia, for
example the genus and species Camellia sinensis [tea]. In particular preferred
plants to be used
as transgenic plants in accordance with the present invention are oil fruit
crops which comprise
large amounts of lipid compounds, such as peanut, oilseed rape, canola,
sunflower, safflower,
poppy, mustard, hemp, castor-oil plant, olive, sesame, Calendula, Punica,
evening primrose,
mullein, thistle, wild roses, hazelnut, almond, macadamia, avocado, bay,
pumpkin/squash,
linseed, soybean, pistachios, borage, trees (oil palm, coconut, walnut) or
crops such as maize,
wheat, rye, oats, triticale, rice, barley, cotton, cassava, pepper, Tagetes,
Solanaceae plants such
as potato, tobacco, eggplant and tomato, Vicia species, pea, alfalfa or bushy
plants (coffee,
cacao, tea), Salix species, and perennial grasses and fodder crops.
Preferred plants according to the invention are oil crop plants such as
peanut, oilseed rape,
canola, sunflower, safflower, poppy, mustard, hemp, castor-oil plant, olive,
Calendula, Punica,
evening primrose, pumpkin/squash, linseed, soybean, borage, trees (oil palm,
coconut).
Especially preferred are sunflower, safflower, tobacco, mullein, sesame,
cotton, pumpkin/squash,
poppy, evening primrose, walnut, linseed, hemp, thistle or safflower. Very
especially preferred
plants are plants such as safflower, sunflower, poppy, evening primrose,
walnut, linseed, or hemp,
or most preferred, plants of family Brassicaceae.
Most preferably, the plant of the present invention is a plant found in the
"Triangle of U", i.e. a
plant of genus Brassica: Brassica napus (AA CC genome; n=19) is an
amphidiploid plant of the
Brassica genus but is thought to have resulted from hybridization of Brassica
rapa (AA genome;
n=10) and Brassica oleracea (CC genome; n=9). Brassica juncea (AA BB genome;
n=18) is an
amphidiploid plant of the Brassica genus that is generally thought to have
resulted from the
hybridization of Brassica rapa and Brassica nigra (BB genome; n=8). Under some
growing
conditions, B. juncea may have certain superior traits to B. napus. These
superior traits may
include higher yield, better drought and heat tolerance and better disease
resistance. Brassica
carinata (BB CC genome; n=17) is an amphidiploid plant of the Brassica genus
but is thought to
have resulted from hybridization of Brassica nigra and Brassica oleracea.
Under some growing
conditions, B. carinata may have superior traits to B. napus. Particularly, B.
carinata allows for an
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increase in VLC-PUFA concentrations by at least 20% compared to B. napus when
transformed
with the same T-DNA.
The plant of the present invention preferably is a "Canola" plant. Canola is a
genetic variation of
rapeseed developed by Canadian plant breeders specifically for its oil and
meal attributes,
particularly its low level of saturated fat. Canola herein generally refers to
plants of Brassica
species that have less than 2% erucic acid (Delta 13-22:1) by weight in seed
oil and less than 30
micromoles of glucosinolates per gram of oil-free meal. Typically, canola oil
may include saturated
fatty acids known as palmitic acid and stearic acid, a monounsaturated fatty
acid known as oleic
acid, and polyunsaturated fatty acids known as linoleic acid and linolenic
acid. Canola oil may
contain less than about 7%(w/w) total saturated fatty acids (mostly palmitic
acid and stearic acid)
and greater than 40%(w/w) oleic acid (as percentages of total fatty acids).
Traditionally, canola
crops include varieties of Brassica napus and Brassica rapa. Preferred plants
of the present
invention are spring canola (Brassica napus subsp. oleifera var. annua) and
winter canola
(Brassica napus subsp. oleifera var. biennis). Furthermore a canola quality
Brassica juncea
variety, which has oil and meal qualities similar to other canola types, has
been added to the
canola crop family (U.S. Pat. No. 6,303,849, to Potts et al., issued on Oct.
16, 2001; U.S. Pat. No.
7,423,198, to Yao et al.; Potts and Males, 1999; all of which are incorporated
herein by reference).
Likewise it is possible to establish canola quality B. carinata varieties by
crossing canola quality
variants of Brassica napus with Brassica nigra and appropriately selecting
progeny thereof,
optionally after further back-crossing with B. carinata, B. napus and/or B.
nigra.
The invention also provides a plant or seed thereof of family Brassicaceae,
preferably of genus
Brassica, with a genotype that confers a heritable phenotype of seed oil VLC-
PUFA content,
obtainable or obtained from progeny lines prepared by a method comprising the
steps of
i) crossing a plant of family Brassicaceae, preferably of genus Brassica,
most preferably of
genus Brassica napus, Brassica oleracea, Brassica nigra or Brassica carinata,
said plant
comprising a a combination of polynucleotides encording for desaturases or
elongases as set
forth in the context of the method of the present invention, a construct or T-
DNA of the present
invention and/or part of such construct or T-DNA, with a parent plant of
family Brassicaceae,
preferably of genus Brassica, most preferably of genus Brassica napus,
Brassica oleracea,
Brassica nigra or Brassica carinata, said plant not comprising said T-DNA
and/or part thereof, to
yield a F1 hybrid,
ii) selfing the F1 hybrid for at least one generation, and
iii) identifying the progeny of step (ii) comprising the combination of
polynucleotides,
theconstruct, T-DNA of the present invention capable of producing seed
comprising an increased
tocopherol content as compared to a control plant. In an embodiment, an
increased tocopherol
content is a tocopherol content as disclosed elsewhere herein.
In an embodiment, the produced seed comprise VLC-PUFA such that the content of
all VLC-
PUFA downstream of 18:1n-9 is at least 40% (w/w) of the total seed fatty acid
content at an oil
content of 40% (w/w), or preferably the content of EPA is at least 8%, or at
least 12% (w/w) and/or
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the content of DHA is at least 1% (w/w) of the total seed fatty acid content
at an oil content of 40%
(w/w).
In an embodiment, the produced seed comprise VLC-PUFA such that the the
content of EPA is
at least 8%, or at least 12%. (w/w).
In an embodiment, the content of DHA is at least 1% (w/w) of the total seed
fatty acid content.
This method allows for effectively incorporation of genetic material of other
members of family
Brassicaceae, preferably of genus Brassica, into the genome of a plant
comprising the
polynucleotides as set forth in the context of the method of the present
invention, a T-DNA, or
construct of the present invention. The method is particularly useful for
combining the
polynucleotides, the T-DNA and/or the construct with genetic material
responsible for beneficial
traits exhibited in other members of family Brassicaceae. Beneficial traits of
other members of
family Brassicaceae are exemplarily described herein, other beneficial traits
or genes and/or
regulatory elements involved in the manifestation of a beneficial trait may be
described elsewhere.
The parent plant not comprising the said polynucleotides, the T-DNA or the
construct of the
present invention or part thereof preferably is an agronomically elite parent.
In particular, the
present invention teaches the transfer of heterologous material from a plant
or seed of the present
invention to a different genomic background, for example a different variety
or species.
In particular, the invention teaches the transfer of the T-DNA or part thereof
(the latter is
particularly relevant for those plants of the present invention which
comprise, in addition to a full
T-DNA or construct of the present invention, also a part of a T-DNA or
construct of the present
invention, said part preferably comprising at least one expression cassette,
the expression
cassette preferably comprising a gene coding for a desaturase or elongase,
preferably a delta-
12-desaturase, delta-6-desaturase and/or omega-3-desaturase) into a species of
genus Brassica
carinata, or to introduce genetic material from Brassica carinata or Brassica
nigra into the plants
of the present invention comprising the T-DNA of the present invention and/or
a part or two or
more parts thereof. According to the invention, genes of Brassica nigra
replacing their homolog
found in Brassica napus or added in addition to the homolog found in Brassica
napus are
particularly helpful in further increasing the amount of VLC-PUFAs in plant
seeds and oils thereof.
Also, the invention teaches novel plant varieties comprising the
polynucleotides encoding for the
desaturases or elongases as set forth in the context of the method of the
present invention, the
construct or T-DNA and/or part thereof of the present invention. Such
varieties can, by selecting
appropriate mating partners, be particularly adapted e.g. to selected climatic
growth conditions,
herbicide tolerance, stress resistance, fungal resistance, herbivore
resistance, increased or
reduced oil content or other beneficial features. It is particularly
beneficial to provide plants of the
present invention wherein the oil content thereof at harvest is lower than
that of corresponding
wild type plants of the same variety, such as to increase the total tocopherol
content (and to
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improve VLC-PUFA amounts) in the oil of said plants of the present invention
and/or tocopherol
concentration (and VLC-PUFA concentrations) in said oil.
Also, the invention provides a method for creating a plant with a genotype
that confers a heritable
phenotype of tocopherol content (in particular an increased content in the
seed oil), obtainable or
obtained from progeny lines prepared by a method comprising the steps of
i) crossing a transgenic plant of the invention with a parent plant not
comprising the
polynucleotides encoding for the desaturases or elongases as set forth in the
context of the
method of the present invention, the construct or T-DNA of the present
invention or part thereof,
said parent plant being of family Brassicaceae, preferably of genus Brassica,
most preferably of
genus Brassica napus, Brassica oleracea, Brassica nigra or Brassica carinata,
to yield a F1
hybrid,
ii) selfing the F1 hybrid for at least one generation, and
iii) identifying the progeny of step (ii) comprising the polynucleotides,
construct or T-DNA
capable of producing seed comprising an increased tocopherol content as
compared to seed of
a control plant.
In an embodiment, said seed may comprise VLC-PUFA such that the content of all
VLC-PUFA
downstream of 18:1n-9 is at least 40% (w/w) of the total seed fatty acid
content at an oil content
of 40% (w/w), or preferably the content of EPA is at least 8% (w/w) and/or the
content of DHA is
at least 1% (w/w) of the total seed fatty acid content at an oil content of
30% (w/w), preferably at
an oil content of 35% (w/w), and more preferably at an oil content of 40%
(w/w).
The method allows the creation of novel variants and transgenic species of
plants of the present
invention, and the seeds thereof. Such plants and seeds exhibit the
aforementioned benefits of
the present invention. Preferably, the content of EPA is at least 10% by
weight, even more
preferably at least 13% (w/w), of the total lipid content of the oil. Also
preferably, the content of
DHA is at least 1.5% by weight, even more preferably at least 2% (w/w), of the
total lipid content
of the oil. The present invention for the first time allows for the
achievement of such high levels of
tocopherol and VLC-PUFA in seed reliably under agronomic conditions, i.e.
representative for the
real yield obtained from seeds of a commercial field of at least 1 ha planted
with plants of the
present invention, wherein the plants have a defined copy number of genes for
implementing the
pathway for production of EPA and/or DHA in said plants, and the copy number
being low, i.e.
single-copy or partial double copy.
A plant of the present invention also includes plants obtainable or obtained
by backcrossing (cross
into the non-transgenic, isogenic parent line), and by crossing with other
germplasms of the
Triangle of U. Accordingly, the invention provides a method for creating a
plant with a genotype
that confers a heritable phenotype of an increased seed oil tocopherol
content, obtainable or
obtained from a progeny line prepared by a method comprising the steps of
i) crossing a transgenic plant of the invention (also called "non-
recurring parent") with a
parent plant not expressing a gene comprised in the polynucleotides, T-DNA or
contruct of the
present invention, said parent plant being of family Brassicaceae, preferably
of genus Brassica,
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most preferably of genus Brassica napus, Brassica oleracea, Brassica nigra or
Brassica carinata,
to yield a hybrid progeny,
ii) crossing the hybrid progeny again with the parent to obtain another
hybrid progeny,
iii) optionally repeating step ii) and
iv) selecting a hybrid progeny comprising the polynucleotides encoding
desaturases or
elongases as set forth in the contect of the method of present invention, the
T-DNA, or the
construct of the present invention.
Backcrossing methods, e.g. as described above, can be used with the present
invention to
improve or introduce a characteristic into the plant line comprising the
polynucleotides, construct
or T-DNA of the present invention. Such hybrid progeny is selected in step iv)
which suffices
predetermined parameters. The backcrossing method of the present invention
thereby
beneficially facilitates a modification of the genetic material of the
recurrent parent with the desired
gene, or preferably the polynucleotides, construct, or T-DNA of the present
invention, from the
non-recurrent parent, while retaining essentially all of the rest of the
desired genetic material of
the recurrent parent, and therefore the desired physiological and
morphological, constitution of
the parent line. The selected hybrid progeny is then preferably multiplied and
constitutes a line as
described herein. Selection of useful progeny for repetition of step ii) can
be further facilitated by
the use of genomic markers. For example, such progeny is selected for the
repetition of step ii)
which comprises, compared to other progeny obtained in the previous crossing
step, most
markers also found in the parent and/or least markers also found in the non-
recurring parent
except the desired polynucleotides, construct, or T-DNA of the present
invention or part of the T-
DNA or construct thereof.
Preferably, a hybrid progeny is selected which comprises the polynucleotides,
construct or T-DNA
of the present invention, and even more preferably also comprises at least one
further expression
cassette from the non-recurring parent of the present invention, e.g. by
incorporation of an
additional part of the construct or T-DNA of the present invention into the
hybrid plant genetic
material.
Further preferably a hybrid progeny is obtained wherein essentially all of the
desired
morphological and physiological characteristics of the parent are recovered in
the converted plant,
in addition to genetic material from the non-recurrent parent as determined at
the 5% significance
level when grown under the same environmental conditions.
Further preferably, a hybrid progeny is selected which produces seed
comprising an increased
tocopherol content as compared to a control, in particular in the oil of
seeds. Also preferably, the
seed comprise VLC-PUFA such that the content of all VLC-PUFA downstream of
18:1n-9 is at
least 40% (w/w) of the total seed fatty acid content at an oil content of 40%
(w/w), or preferably
the content of EPA is at least 8% (w/w) and/or the content of DHA is at least
1% (w/w) of the total
seed fatty acid content at an oil content of 30% (w/w), preferably at an oil
content of 35% (w/w),
and more preferably at an oil content of 40% (w/w).
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It is to be understood that such seed VLC-PUFA or tocopherol content is to be
measured not from
a single seed or from the seeds of an individual plant, but refers to the
numeric average of seed
VLC-PUFA content of at least 100 plants, even more preferably of at least 200
plants, even more
preferably of at least 200 plants half of which have been grown in field
trials in different years.
The choice of the particular non-recurrent parent will depend on the purpose
of the backcross.
One of the major purposes is to add some commercially desirable, agronomically
important trait
to the line.
The term "line" refers to a group of plants that displays very little overall
variation among
individuals sharing that designation. A "line" generally refers to a group of
plants that display little
or no genetic variation between individuals for at least one trait. A "DH
(doubled haploid) line," as
used in this application refers to a group of plants generated by culturing a
haploid tissue and
then doubling the chromosome content without accompanying cell division, to
yield a plant with
the diploid number of chromosomes where each chromosome pair is comprised of
two duplicated
chromosomes. Therefore, a DH line normally displays little or no genetic
variation between
individuals for traits. Lines comprising one or more genes originally
comprised in a T-DNA of the
present invention in the non-recurring parent also constitute plants of the
present invention.
The invention is also concerned with a method of plant oil and/or tocopherol
production (in
particular for tocopherol production), comprising the steps of
i) growing a plant of the present invention such as to obtain oil-
containing seeds thereof,
ii) harvesting said seeds, and
iii) extracting oil from said seeds harvested in step ii).
Preferably the oil has an increased tocopherol content, in particular as
compared to the oil
extracted from seeds of a control plant. Preferred increased tocopherol
contents are disclosed
elsewhere herein.
The extraction step under iii) is preferably carried out under conditions
which maintain the
tocopherol content of the oil. Conditions which maintain the tocopherol
content of the oil in the
context of the present invention shall be conditions which do not reduce the
tocopherol content.
Such conditions are well known in the art and are e.g. described in Willner et
al. Einflull der
Prozeflparameter auf die Tocopherolbilanz bei der Gewinnung von pflanzlichen
Olen. Lipid / Fett,
Volume 99, Issue 4, pages 138-147, 1997 which herewith is incorporated by
reference in its
entirety.
In addition, the oil may have a DHA content of at least 1% by weight based on
the total lipid
content and/or an EPA content of at least 8% by weight based on the total
lipid content.
In a further step, the method may comprise the step iv) of isolating
tocopherol from the oil
extracted in step iii).
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In an embodiment, the term "isolating tocopherol" means "enriching
tocopherol".
How to isolate tocopherol from oil is well known in the art and e.g. described
in "Commercial
Extraction of Vitamin E from Food Sources" in The Encyclopedia of Vitamin E,
Preedy, V.R. and
Watson R.R. (eds.), CABI Publishers, Oxford, U.K., pp. 140-152 and in US
5,627,289. Both
documents are incorporated herein in their entirety.
For example, tocopherols can be isolated from by varous methods such as
esterification of the
free fatty acids in the oil, by saponification which allows for revomal of
fatty components from the
oil, distillation, by chromatographic methods, by enzymatic methods (by using
lipase) etc.. These
and further methods are described in the the chapter of "The Encyclopedia of
Vitamin E" referred
to in the previous paragraph in detail.
In an embodiment, the isolation comprises esterifying free fatty acids in said
oil with methanol;
transesterifying triglycerides in said oil by alkali-catalyzed
transesterification with methanol;
acidifying and then washing the oil resulting from said transesterification;
and removing by
distillation fatty acid methyl esters from the oil resulting from said
acidifying and washing. In an
embodiment, steam distillates of the oil are used as the oil.
In an embodiment, an inorganic acid such as hydrochloric acid is used for the
acidifying.
In an embodiment, 1 to 1.5 parts by volume of said mixture is esterified using
1 part by volume of
methanol.
In an embodiment, the free fatty acids are esterified at a temperature of 60
to 100 C (in particular
at temperature of 65 to 70 C). Preferably, the fatty acids are esterified the
presence of a strongly
acidic ion exchanger.
Preferably, the oil comprises EPA, DHA, and/or DPA n-3 in concentrations
described herein
below.
Also preferably, the content of EPA is at least 8% by weight, even more
preferably at least 10%
(w/w), of the total lipid content of the oil. Preferably, the content of DHA
is at least 1% by weight,
even more preferably at least 1.5% (w/w), of the total lipid content of the
oil. As described herein,
the plant of the present invention comprises, for the purposes of such method
of plant oil
production, preferably comprises the polynucleotides, the construct, or the T-
DNA of the present
invention and optionally also one or more additional parts of the T-DNA or of
the construct,
wherein the part or parts, respectively, comprise at least one expression
cassette of the T-DNA
of the present invention.
The present invention also relates to oil comprising an increased tocopherol
content. Preferably,
said oil is obtainable by the aforementioned methods, or produced by the plant
of the present
invention. Preferably, said oil also comprises an increased content of VLC-
PUFA (The term "high
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content" and "increased content" are used interchangeably herein). For
example, the oil can
comprise EPA, DHA, and/or DPA n-3 in concentrations described herein below.
The term "oil" refers to a fatty acid mixture comprising unsaturated and/or
saturated fatty acids
which are esterified to triglycerides. Preferably, the triglycerides in the
oil of the invention comprise
PUFA or VLC-PUFA moieties as referred to above. The amount of esterified PUFA
and/or VLC-
PUFA is, preferably, approximately 30%, a content of 50% is more preferred, a
content of 60%,
70%, 80% or more is even more preferred. The oil may further comprise free
fatty acids,
preferably, the PUFA and VLC-PUFA referred to above. For the analysis, the
fatty acid content
can be, e.g., determined by GC analysis after converting the fatty acids into
the methyl esters by
transesterification. The content of the various fatty acids in the oil or fat
can vary, in particular
depending on the source. The oil, however, shall have a non-naturally
occurring composition with
respect to the PUFA and/or VLC-PUFA composition and content. It is known that
most of the fatty
acids in plant oil are esterified in triacylglycerides. Accordingly, in the
oil of the invention, the
PUFAs and VLC-PUFAs, preferably, also occur in esterified form in the
triacylglcerides. It will be
understood that such a unique oil composition and the unique esterification
pattern of PUFA and
VLC-PUFA in the triglycerides of the oil shall only be obtainable by applying
the methods of the
present invention specified above. Moreover, the oil of the invention may
comprise other
molecular species as well. Specifically, it may comprise minor amounts of the
polynucleotide or
vector of the invention. Such low amounts, however, can be detected only by
highly sensitive
techniques such as PCR.
As described above, these oils, lipids or fatty acids compositions,
preferably, comprise (by weight)
6 to 15% of palmitic acid, 1 to 6% of stearic acid, 7-85% of oleic acid, 0.5
to 8% of vaccenic acid,
0.1 to 1% of arachic acid, 7 to 25% of saturated fatty acids, 8 to 85% of
monounsaturated fatty
acids and 60 to 85% of polyunsaturated fatty acids, in each case based on 100%
and on the total
fatty acid content of the organisms (preferably by weight). Preferred VLC-
PUFAs present in the
fatty acid esters or fatty acid mixtures is, preferably, 1% to 20% DHA, or
5,5% to 20% of DHA
and/or 9,5% to 30% EPA based on the total fatty acid content (preferably by
weight).
The oils, lipids or fatty acids according to the invention, preferably,
comprise at least 1%, 2%, 3%,
4% 5.5%, 6%, 7% or 7,5%, more preferably, at least 8%, 9%, 10%, 11% or 12%,
and most
preferably at least 13%,14%,15%,16%. 17%, 18%, 19% or 20% of DHA, and/or at
least 9.5%,
10%, 11% or 12%, more preferably, at least 13%, 14%, 14,5%, 15% or 16%, and
most preferably
at least 17%,18%,19%,20%. 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29% or 30%
of EPA
(preferably by weight) based on the total fatty acid content of the production
host cell, organism,
advantageously of a plant, especially of an oil crop such as soybean, oilseed
rape, coconut, oil
palm, safflower, flax, hemp, castor-oil plant, Calendula, peanut, cacao bean,
sunflower or the
abovementioned other monocotyledonous or dicotyledonous oil crops.
The seeds of the present invention shall comprise the oil or lipid of the
present invention.
Preferably, the oil or lipid is extracted, obtained, obtainable or produced
from a plant, more
preferably from seeds of a plant or plants (in particular a plant or plants of
the present invention).
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The oil or lipid thus can be obtained by the methods of the present invention.
In particular, the
plant oil or plant lipid is an extracted plant oil or lipid.. Also preferably,
said oil or lipid is extracted,
obtained, obtainable or produced from a plant, more preferably from batches of
seeds or bulked
seeds of a plant or plants (in particular a plant or plants of the present
invention).
Preferably, the term "extracted" in connection with an oil or lipid refers to
an oil or lipid that has
been extracted from a plant, in particular from seeds of a plant or plants.
More preferably, the
term "extracted" in connection with an oil or lipid refers to an oil or lipid
that has been extracted
from a plant, in particular from batch of seeds or bulked seeds of a plant or
plants. Such oil or
lipid can be a crude composition. However, it may be also a purified oil or
lipid in which e.g. the
water has been removed. In an embodiment, the oil or lipid is not blended with
fatty acids from
other sources.
The oil or lipid of the present invention may be also an oil or lipid in a
seed of plant. Preferably,
said plant is a transgenic plant. More preferably, said plant is a plant of
the present invention. In
a particular preferred embodiment, the plant is a Brassica plant.
The oil or lipid of the present invention shall comprise fatty acids. In
particular, the oil or lipid shall
comprise fatty acids in esterified form. Thus, the fatty acids shall be
esterified. Preferably, the oil
or lipid of the present comprises one or more of following fatty acids (in
esterified form):
Eicosapentaenoic acid (Timnodonic acid, EPA, 20:5n-3), Clupanodonic acid (DPA
n-3), and DHA
((Z,Z,Z,Z,Z,Z)-4,7,10,13,16,19-Docosahexaenoic acid). In an embodiment, the
oil or lipid
comprises EPA and DHA. Further, it is envisaged that the oil or lipid
comprises EPA, DHA, and
DPA n-3.
Preferred contents of the aforementioned fatty acids in the total fatty acid
content of the lipid or
oil of the present invention is further described in the following. In the
following, ranges are given
for the contents. The contents (levels) of fatty acids given herein are
expressed as percentage
(weight of a particular fatty acid) of the total weight of all fatty acids
(present in the oil or lipid).
The contents are thus, preferably given as weight percentage (% w/w). The
contents given below
are considered as high contents.
Preferably, the fatty acids are present in esterified form. Thus, the fatty
acids shall be esterified
fatty acids.
As set forth above, the oil or lipid may comprise EPA (20:5n-3). Preferably,
the content of
Eicosapentaenoic acid (Timnodonic acid, EPA, 20:5n-3) is between 0.1% and 20%,
more
preferably between 2% and 15%, most preferably between 5% and 10% of the total
fatty acid
content. Further, it is envisaged that the content of EPA is between 5% and
15% of the total fatty
acid content.
As set forth above, the oil or lipid may comprise Clupanodonic acid (DPA n-3).
Preferably, the
content of Clupanodonic acid (DPA n-3) is between 0.1% and 10%, more
preferably between 1%
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and 6%, most preferably between 2% and 4% of the total fatty acid content. In
addition, the
content of DPA n-3 may be at least 2% of the total fatty acids.
As set forth above, the oil or lipid may comprise DHA. Preferably, the content
of DHA is between
1% and 10%, more preferably between 1% and 4%, most preferably between 1% and
2% of the
total fatty acid content. Further, it is envisaged that the content of DHA is
between 1% and 3% of
the total fatty acid content.
A further embodiment according to the invention is the use of the oil, lipid,
fatty acids and/or the
fatty acid composition in feedstuffs, foodstuffs, dietary supplies, cosmetics
or pharmaceutical
compositions as set forth in detail below. The oils, lipids, fatty acids or
fatty acid mixtures
according to the invention can be used for mixing with other oils, lipids,
fatty acids or fatty acid
mixtures of animal origin such as, for example, fish oils.
The term "composition" refers to any composition formulated in solid, liquid
or gaseous form. Said
composition comprises the compound of the invention optionally together with
suitable auxiliary
compounds such as diluents or carriers or further ingredients. In this
context, it is distinguished
for the present invention between auxiliary compounds, i.e. compounds which do
not contribute
to the effects elicited by the compounds of the present invention upon
application of the
composition for its desired purpose, and further ingredients, i.e. compounds
which contribute a
further effect or modulate the effect of the compounds of the present
invention. Suitable diluents
and/or carriers depend on the purpose for which the composition is to be used
and the other
ingredients. The person skilled in the art can determine such suitable
diluents and/or carriers
without further ado. Examples of suitable carriers and/or diluents are well
known in the art and
include saline solutions such as buffers, water, emulsions, such as oil/water
emulsions, various
types of wetting agents, etc.
In a more preferred embodiment of the oil-, fatty acid or lipid-containing
composition, the said
composition is further formulated as a pharmaceutical composition, a cosmetic
composition, a
foodstuff, a feedstuff, preferably, fish feed or a dietary supply.
The term "pharmaceutical composition" as used herein comprises the compounds
of the present
invention and optionally one or more pharmaceutically acceptable carrier. The
compounds of the
present invention can be formulated as pharmaceutically acceptable salts.
Acceptable salts
comprise acetate, methylester, Hel, sulfate, chloride and the like. The
pharmaceutical
compositions are, preferably, administered topically or systemically. Suitable
routes of
administration conventionally used for drug administration are oral,
intravenous, or parenteral
administration as well as inhalation. However, depending on the nature and
mode of action of a
compound, the pharmaceutical compositions may be administered by other routes
as well. For
example, polynucleotide compounds may be administered in a gene therapy
approach by using
viral vectors or viruses or liposomes.
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Moreover, the compounds can be administered in combination with other drugs
either in a
common pharmaceutical composition or as separated pharmaceutical compositions
wherein said
separated pharmaceutical compositions may be provided in form of a kit of
parts. The compounds
are, preferably, administered in conventional dosage forms prepared by
combining the drugs with
standard pharmaceutical carriers according to conventional procedures. These
procedures may
involve mixing, granulating and compressing or dissolving the ingredients as
appropriate to the
desired preparation. It will be appreciated that the form and character of the
pharmaceutically
acceptable carrier or diluent is dictated by the amount of active ingredient
with which it is to be
combined, the route of administration and other well-known variables. The
carrier(s) must be
acceptable in the sense of being compatible with the other ingredients of the
formulation and
being not deleterious to the recipient thereof. The pharmaceutical carrier
employed may be, for
example, a solid, a gel or a liquid. Exemplary of solid carriers are lactose,
terra alba, sucrose,
talc, gelatin, agar, pectin, acacia, magnesium stearate, stearic acid and the
like. Exemplary of
liquid carriers are phosphate buffered saline solution, syrup, oil such as
peanut oil and olive oil,
water, emulsions, various types of wetting agents, sterile solutions and the
like. Similarly, the
carrier or diluent may include time delay material well known to the art, such
as glyceryl mono-
stearate or glyceryl distearate alone or with a wax. Said suitable carriers
comprise those
mentioned above and others well known in the art, see, e.g., Remington's
Pharmaceutical
Sciences, Mack Publishing Company, Easton, Pennsylvania. The diluent(s) is/are
selected so as
not to affect the biological activity of the combination. Examples of such
diluents are distilled
water, physiological saline, Ringer's solutions, dextrose solution, and Hank's
solution. In addition,
the pharmaceutical composition or formulation may also include other carriers,
adjuvants, or
nontoxic, nontherapeutic, nonimmunogenic stabilizers and the like. A
therapeutically effective
dose refers to an amount of the compounds to be used in a pharmaceutical
composition of the
present invention which prevents, ameliorates or treats the symptoms
accompanying a disease
or condition referred to in this specification.
The term "cosmetic composition" relates to a composition which can be
formulated as described
for a pharmaceutical composition above. For a cosmetic composition, likewise,
it is envisaged
that the compounds of the present invention are also, preferably, used in
substantially pure form.
Impurities, however, may be less critical than for a pharmaceutical
composition. Cosmetic
compositions are, preferably, to be applied topically.
Preferred cosmetic compositions comprising the compounds of the present
invention can be
formulated as a hair tonic, a hair restorer composition, a shampoo, a powder,
a jelly, a hair rinse,
an ointment, a hair lotion, a paste, a hair cream, a hair spray and/or a hair
aerosol.
Seeds of three events described in detail in the examples section below have
been deposited at
ATCC under the provisions of the Budapest treaty on the International
Recognition of the Deposit
of Microorganisms for the Purposes of Patent Procedure, i.e. seeds of event
"LBFLFK" = ATCC
Designation "PTA-121703", seeds of event "LBFDHG" = ATCC designation "PTA-
121704", and
seeds of the event "LBFDAU" = ATCC Designation "PTA-122340". Applicants have
no authority
to waive any restrictions imposed by law on the transfer of biological
material or its transportation
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PCT/EP2015/076608
in commerce. Applicants do not waive any infringement of their rights granted
under this patent
or rights applicable to the deposited events under the Plant Variety
Protection Act (7 USC sec.
2321, et seq.), Unauthorized seed multiplication prohibited. This seed may be
regulated according
to national law. The deposition of seeds was made only for convenience of the
person skilled in
the art and does not constitute or imply any confession, admission,
declaration or assertion that
deposited seed are required to fully describe the invention, to fully enable
the invention or for
carrying out the invention or any part or aspect thereof. Also, the deposition
of seeds does not
constitute or imply any recommendation to limit the application of any method
of the present
invention to the application of such seed or any material comprised in such
seed, e.g. nucleic
acids, proteins or any fragment of such nucleic acid or protein.
The deposited seeds are derived from plants that were transformed with the T-
DNA vector having
a sequence as shown in SEQ ID NO: 3.
The invention is further described by means of accompanying examples, which,
however, are not
intended to limit the scope of the invention described herein.
EXAMPLES
Example 1: Materials and Methods
A. General cloning methods
Cloning methods as e.g. use of restriction endonucleases to cut double
stranded DNA at specific
sites, agarose gel electrophoreses, purification of DNA fragments, transfer of
nucleic acids onto
nitrocellulose and nylon membranes, joining of DNA-fragments, transformation
of E. coli cells and
culture of bacteria were performed as described in Sambrook et al. (1989)
(Cold Spring Harbor
Laboratory Press: ISBN 0-87965-309-6). Polymerase chain reaction was performed
using
PhusionTM High-Fidelity DNA Polymerase (NEB, Frankfurt, Germany) according to
the
manufacturer's instructions. In general, primers used in PCR were designed
such that at least 20
nucleotides of the 3' end of the primer anneal perfectly with the template to
amplify. Restriction
sites were added by attaching the corresponding nucleotides of the recognition
sites to the 5' end
of the primer. Fusion PCR, for example described by K. Heckman and L. R.
Pease, Nature
Protocols (2207) 2, 924-932 was used as an alternative method to join two
fragments of interest,
e.g. a promoter to a gene or a gene to a terminator. Gene Synthesis, as for
example described
by Czar et al. (Trends in Biotechnology, 2009, 27(2): 63-72), was performed by
Life Technologies
using their Geneart service. The Geneart technology, described in
W02013049227 allows
production of genetic elements of a few basepair (bp) in length, and was used
in this invention to
produce entire plasmids of about 60,000bp. Chemical synthesis of nucleotides
to polynucleotides
was employed for short DNA fragments, which were then combined in a
sequential, modular
fashion to fragments of increasing size using a combination of conventional
cloning techniques
as described in W02013049227.
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B. Different types of plant transformation plasmids suitable to transfer of
multiple expression
cassettes encoding multiple proteins into the plant genome.
For agrobacteria based plant transformation, DNA constructs preferably meet a
number of
criteria: (1) The construct carries a number of genetic elements that are
intended to be inserted
into the plant genome on a so called Transfer DNA (T-DNA) between a 'T-DNA
Left Border' (LB)
and 'T-DNA Right Border' (2) The construct replicates in E.coli, because most
cloning steps
require DNA multiplication steps in E.cok (3) The construct replicates in
Agrobacterium (e.g. A.
tumefaciens or A. rhizogenes), because the plant transformation methods rely
on using
Agrobacterium to insert the genetic elements of interest into the plant genome
of a cell that was
infected by Agrobacterium. (4) The construct contains supporting genetic
elements that encode
proteins which are required for infection of the plant cell, and for transfer
and integration of desired
genetic elements into the plant genome of an plant cell infected by the
Agrobacterium, or the
construct was used in combination with a second construct containing such
supporting genetic
elements that was present in the same Agrobacterium cell. (5) The constructs
can contain
selection markers to facilitate selection or identification of bacterial cells
that contain the entire
construct, and of a plant cell(s) that contains the desired genetic elements.
An overview of
available plasmids was given in Komori et al (2007).
C. Assembly of genes required for EPA and DHA synthesis within BiBAC T-
plasmids
containing the F factor / pRI origin of replication
For synthesis of VLC-PUFA in Brassica napus seeds, the set of genes encoding
the proteins of
the metabolic VLC-PUFA pathway were combined with expression elements
(promoter,
terminators and introns) and transferred into a binary t-plasmid that was used
for agrobacteria
mediated transformation of plants. All expression cassettes have been combined
onto a single
binary T-plasmid. The advance of DNA synthesis allows numerous companies to
offer services
to use a combination of chemical synthesis and molecular biological techniques
to synthesize de
novo, without an initial template, polynucleotides up to the size of microbial
genomes. Synthesis
used in the construction of the plasmid described in this example was
performed by Life
Technologies using their Geneart service. The Geneart technology, described
in
W02013049227 allows production of genetic elements of a few basepair (bp)
length, and was
used in this invention to produce the binary T-plasmid for plant
transformation VC-LTM593-1qcz
rc having a total size of -61.000bp. The structure of the plasmid VC-LTM593-
1qcz rc is given in
Table 1.
Table 1: Genetic Elements of plasmid VC-LTM593-1qcz rc. Listed are the names
of the elements,
the position in VC-LTM593-1qcz rc (nucleotide number, note: start position was
larger than stop
position for elements encoded by the complementary strand of VC-LTM593-1qcz
rc), the function
and source of the element. The T-DNA integrated into the plant genome during
the transformation
process was flanked by a right border (nucleotides 59895 to 148 of VC-LTM593-
1qcz rc) and a
left border (nucleotides 43830 to 43695 of VC-LTM593-1qcz rc). Elements
outside of that region
(=vector backbone) are required for cloning and stable maintenance in E. coli
and/or agrobacteria.
The sequence of this vector is shown in SEQ ID NO: 3. The locations (of the
e.g. of promoters,
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genes, introns, terminators and separators) in SEQ ID NO: 3 are indicted in
the second and third
column.
Genetic Elements of plasmid VC-
Description, Function and Source of
LTM593-1qcz rc From ToElement
Promoter from UNKNOWN SEED
p-VfUSP_684bp[LLL894] 329
1012 PROTEIN gene USP (accession:
X56240) from Vicia faba
i-Atss18_252bp functional intron
region; intron with partial 5' UTR,
Arabidopsis thaliana, Locus
i-Atss 18_252 [LJ K36] 1013
1264 At1g01170, + 37 to + 288 bp
(numbering relative to start of
transcription) (+ 72 to + 282bp
5'UTR-Intron only)
Delta-6 ELONGASE from
c-d6Elo(Pp_GA2) 1267 2139
Physcomitrella patens
Terminator CaMV35S from 35S
t-CaMV35S 2140 2355
gene from Cauliflower mosaic virus
Promoter from CONLININ gene
p-LuCnI(1064bp) 2448 3511
from Linum usitatissimum
i-Atss14_377bp[LJK32] functional
intron region; intron with partial
5'UTR, Arabidopsis thaliana, Locus
i-Atss 14_377bp[LJ K32] 3512 3888 At5g63190, +166 to + 542 bp
(numbering relative to start of
transcription) (+201 to + 542 bp
5'UTR-Intron only)
Delta-5 DESATURASE from
c-d5Des(Tc_GA2) 3892 5211
Thraustochytrium sp. ATCC21685
Terminator from OCTOPINE
t-AgrOCS 192bp[LED12] 5212 5403 SYNTHASE gene OCS from
Agrobacterium tumefaciens
Promoter from a SUCROSE-
p-SBP 5539 7337 BINDING PROTEIN-RELATED
gene from Vicia faba
i-Atss2_455bp functional intron
region; intron with partial 5'UTR,
Arabidopsis thaliana, Locus
i-Atss2_455bp[LJ K20] 7338 7792 At1g65090,
+77 to +531bp
(numbering relative to start of
transcription) (+113 to + 508bp
5'UTR-Intron only)
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Genetic Elements of plasmid VC- Description, Function and Source
of
From To
LTM593-1qcz rc Element
Delta-6 DESATURASE from
c-d6Des(Ot_febit) 7802 9172
Ostreococcus tauri
Terminator from CATHEPSIN D
t-StCATHD-pA 9200 9434 INHIBITOR gene [CATHD] from
Solanum tuberosum [Potato]
Promoter from PEROXIREDOXIN
p-LuPXR 1727bp[LLL823] 9513 11239 LIKE protein gene PXR from Linum
usitatissimum
i-Atss1_847bp functional intron
region; intron with partial 5' UTR,
Arabidopsis thaliana, Locus
At1g62290 (aspartyl protease
family protein), +1 to +847bp
i-Atss1_846bp[1tm593] 11240 12085
(numbering relative to start of
transcription) (+19 to +841bp
5'UTR-Intron only); 1 bp at poly T
stretch shorter compared to original
i-Atss1_847bp
Delta-6 ELONGASE from
c-d6Elo(Tp_GA2) 12099 12917
Thalassiosira pseudonana
Terminator from peroxiredoxin like
t-AtPXR 400bp[LLL823] 12973 13372 protein gene PXR (At1g48130) from
Arabidopsis thaliana
Promoter from napA/B gene (napin,
p-Napin A/B 13542 14205 seed storage protein) from
Brassica
napus
i-Atss14_377bp[LJ K32] functional
intron region; intron with partial 5'
UTR, Arabidopsis thaliana, Locus
i-Atss14_377bp[LJ K32] 14206 14582 At5g63190, +166 to + 542 bp
(numbering relative to start of
transcription) (+201 to + 542 bp
5'UTR-Intron only)
Delta-12 DESATURASE from
c-d 12 Des(Ps_GA2) 14589 15785
Phythophthora sojae
Terminator from Small Subunit of
t-E9 15804 16361 RuBisCo rbcS gene (E9) from
Pisum sativum
p-BnSETL-v1[1234bp] 16454 17687 SETL-vl Brassica napus promoter
Omega-3 DESATURASE from
c-o3Des(Pir_GA) 17690 18781
Pythium irregulare
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Genetic Elements of plasmid VC- Description, Function and Source
of
From To
LTM593-1qcz rc Element
t-BnSETL 18803 19416 SETL-vl Brassica napus terminator
Promoter from UNKNOWN SEED
p-VfUSP_684bp[LLL894] 19495 20178 PROTEIN gene USP (accession:
X56240) from Vicia faba
i-Atss18_252bp functional intron
region; intron with partial 5' UTR,
Arabidopsis thaliana, Locus
i-Atss18_252[11 K36] 20179 20430 At1g01170, + 37 to + 288 bp
(numbering relative to start of
transcription) (+ 72 to + 282bp
5'UTR-Intron only)
Omega-3-DESATURASE from
c-o3Des(Pi_GA2) 20441 21526
Phythophthora infestans
Terminator CaMV35S from 35S
t-CaMV35S 21535 21750
gene from Cauliflower mosaic virus
p-BnSETL-v1[1234bp] 21886 23119 SETL-vl Brassica napus promoter
Delta-5 DESATURASE from
c-d5Des(Tc_GA2) 23122 24441
Thraustochytrium sp. ATCC21685
t-BnSETL 24463 25076 SETL-vl Brassica napus terminator
Promoter derived from a promoter
p-ARC5_perm1 25223 26373 from ARCILINE 5 gene from
Phaseolus vulgaris
Delta-4 DESATURASE from
c-d4Des(Tc_GA3) 26384 27943
Thraustochytrium sp.
Terminator of ARC5 gene from
t-pvarc 27957 28556
Phaseolus vulgaris
Promoter from PEROXIREDOXIN
p-LuPXR 1727bp[LLL823] 28649 30375 LIKE protein gene PXR from Linum
usitatissimum
i-Atss15_758bp[LJ K33] functional
intron region; intron with partial
5'UTR, Arabidopsis thaliana, Locus
i-Atss15_758bp[LJ K33] 30376 31133 At2g27040, +93 bp to + 850 bp
(numbering relative to start of
transcription) (+128 to + 847 bp
5'UTR-Intron only)
Omega-3 DESATURASE from
c-o3Des(Pir_GA) 31149 32240
Pythium irregulare
Terminator from PEROXIREDOXIN
t-AtPXR 400bp[LLL823] 32297 32696
LIKE protein gene PXR
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Genetic Elements of plasmid VC-
Description, Function and Source of
LTM593-1qcz rc From ToElement
(At1g48130) from Arabidopsis
thaliana
Promoter from CONLININ gene
p-LuCnI(1064bp) 32832 33895
from Linum usitatissimum
i-Atss2_455bp functional intron
region; intron with partial 5'UTR,
Arabidopsis thaliana, Locus
i-Atss2_455bp[LJK20] 33896 34350 At1g65090, +77 to +531bp
(numbering relative to start of
transcription) (+113 to + 508bp
5'UTR-Intron only)
Delta-4 DESATURASE from
c-d4Des(PI_GA)2 34360 35697
Pavlova lutheri
Terminator from OCTOPINE
t-AgrOCS 192bp[LED12] 35719 35910 SYNTHASE gene OCS from
Agrobacterium tumefaciens
Promoter from Beta-KETOACYL-
p-BnFael 36104 37533 CoA SYNTHASE (FAE1.1) gene
from Brassica napus
i-Atss1_847bp functional intron
region; intron with partial 5' UTR,
Arabidopsis thaliana, Locus
At1g62290 (aspartyl protease
i-Atss1_847bp[LJ K19] 37534 38380 family protein), +1 to +847bp
(numbering relative to start of
transcription) (+19 to +841bp
5'UTR-Intron only); from QC1153-
1/RTP6393.
c-d5Elo(Ot_GA3) 38388 39290 Delta-5 ELONGASE
from
Ostreococcus tauri
Terminator from FATTY ACID
t-bnFae1 39307 39706 ELONGASE (FAE1, At4g34520)
gene of Arabidopsis thaliana
MTX Parsley UBI4-2 promoter with
p-YPC105906_PcUbi4-2[Iong] 39830 40806
internal intron
ACETOHYDROXYACID
SYNTHASE LARGE-SUBUNIT
c- 40814 42826 gene/CDS from Arabidopsis with
AtAHASL_A122T_S653N[minusRES]
S653N (csr1-2) mutation and
A122T SDM mutation minus
restriction sites
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Genetic Elements of plasmid VC-
Description, Function and Source of
From To
LTM593-1qcz rc Element
Arabidopsis (dicot) AtAHASL 3' Un-
translated Region
[trimmed]
t-AtAHAS-3'UTR[rtp4820] 42827 43606 terminator for
AC ETOHYDROXYAC I D
SYNTHASE gene
Left T-DNA Left border from
b-LLB 43830 43695
pTi15955 [Genbank #AF242881]
Kanamycin Resistance selection
c-KanR_Tn903 45777 44962
gene/CDS
Promoter for Kanamycin resistance
p-Kan[Im500] 45898 45778
gene
o-ori-2 47051 47267 ori-2 origin of replication
c-repE 47361 48116 repE gene/CDS
c-sopA 48695 49870 sapA gene/CDS
c-sopB 49870 50841 sopB gene/CDS
c-sopC/incD 50914 51387 incDlsopC partial gene/CDS
c-tral 51890 51949 tral gene/CDS
regulatory region of traR dependent
quorum sensing regulon -
containing 2 tra-boxes (see LI AND
mf-tral - repA intergenic region 51938 52300
FARRAND JOURNAL OF
BACTERIOLOGY, Jan. 2000, p.
179-188)
Rep-A gene from pTiC58 replicon
(LI AND FARRAND JOURNAL OF
o-repA 52301 53518
BACTERIOLOGY, Jan. 2000, p.
179..188)
rep-B gene from pTiC58 replicon (LI
AND FARRAND JOURNAL OF
rr-repB 53748 54758
BACTERIOLOGY, Jan. 2000, p.
179..188)
rep-C gene from pTiC58 replicon (LI
AND FARRAND JOURNAL OF
o-repC 54973 56292
BACTERIOLOGY,Jan. 2000, p.
179..188)
fragment of DNA invertase
mf-y4cG 56771 56301 homolog; similar to Rhizobium sp.
NGR234 pNGR234a Y4CG
tr-Tn5 58811 57250 Transposon Tn5 sequence
o-oriT 59107 59275 oriT from pRK310 genbank file
b-RB[rtp4394] 148 59895 Right T-DNA Right border
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D. Procedure for production of transgenic plants using BiBACs
In general, the transgenic rapeseed plants were generated by a modified
protocol according to
DeBlock et al. 1989, Plant Physiology, 91:694-701). Overnight cultures of the
strain intended to
be transformed was prepared in YEB medium with antibiotics (20 mg/L
chloramphenicol, 5 mg/L
tetracycline, 50 mg/L kanamycin) and grown at 28 C. On the next day the
optical density of the
culture was checked at 600 nm wave length. It reached about 1Ø Cultures of
lower optical density
were extended in cultivation period. Cultures with an optical density of above
1.3 were diluted
with YEB medium to an OD of approximately 0.2 and cultured until they reached
an OD of 1Ø
Cultures were pelleted at about 4000 g and re-suspended in liquid MS medium
(Murashige and
Skoog 1962), pH 5.8, 3% sucrose with 100 mg/L Acetosyringone to reach an
OD600. of 0.1. The
Agrobacterium suspensions were used for inoculation of hypocotyl segments
prepared from 5
days old etiolated seedlings.
Seeds were germinated for five days under low light conditions (< 50 pMol/m2s)
using MSB5
medium from Duchefa (Duchefa Biochemie, PO Box 809 2003 RV Haarlem,
Netherlands), pH
5.8, 3% sucrose and 0.8% Oxoid agar. Germination under light conditions
produces explants,
which are more stable and easier to handle compared to etiolated hypocotyls.
Hypocotyl
segments of 4 to 7 mm length were inoculated in a bath of Agrobacterium cells
under gentle
shaking up to 4 min and sieved after the incubation. . Infected explants were
transferred to petri
dishes with co-cultivation medium (MS medium, pH 5.6, 3% sucrose, 0.6 g/L MES
(2-(N-
Morpholino)ethanesulfonic acid), 18 g/L mannitol, 0.7% phytoagar (Duchefa
Biochemie, PO Box
809 2003 RV Haarlem, Netherlands, part number SKU:P1003), 100 mg/L
Acetosyringone, 200
mg/L L-Cysteine, 1 mg/L 2,4D (2,4-Dichlorophenoxyacetic acid)) carrying one
layer of Whatman
filter paper on its surface. Petri dishes were sealed with tape and incubated
at 23 C under long
day conditions (16 h light/8 h darkness) for three days. After the three days
co-cultivation period
explants were transferred to MS medium, pH 5.6, 3% sucrose, 0.6 g/L MES, 18
g/L mannitol, 07%
Phytoagar, 1 mg/L 2,4D and 500 mg/L Carbenicillin to prevent Agrobacterium
growth and
incubated for a recovery period under the same physical conditions as for the
co-cultivation for 7
days.
For selective regeneration explants were transferred after the recovery period
to MS medium, pH
5.8, 3% sucrose, 0.7% Phytoagar, 2.5 mg/L AgNO3, 3 mg/L BAP (6-
Benzylaminopurine), 0.1 mg/L
GA (Gibberellic acid), 0.1 mg/L NAA (1-Naphthaleneacetic acid), 500 mg/L
Carbenicillin, 100 nM
lmazethapyr (Pursuit) and cultured for two weeks under long day conditions as
described above.
Sub-cultivation takes place every two weeks. Hormones were stepwise reduced as
follows: BAP
3 to 0.5 to 0.05 mg/L; GA (Gibberellic acid) 0.1 to 0.25 to 0.25 mg/L; NAA 0.1
to 0 to 0 mg/L.
Developing shootlets could be harvested after the second cycle of selective
regeneration.
Shootlets were cut and transferred to either Elongation/rooting medium (MS
medium, pH 5.8,
2%sucrose, 100 mg/L myo-inositol, 40 mg/L Adenine sulphate, 500 mg/L MES, 0.4%
Sigma Agar,
150 mg/L Timentin, 0.1 mg/L IBA (Indole-3-butyric acid)) or to rock wool/stone
wool or foam mats
(Grodan, GRODAN Group P.O. Box 1160, 6040 KD Roermond The Netherlands, or
Oasis, 919
Marvin Street, Kent, OH 44240 USA) watered with 1/10 Vol. of MS medium, pH 5.8
without
sucrose under ex vitro long day conditions in covered boxes.
Shoots were elongated and rooted in in vitro medium and were transferred
directly to soil.
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Either in vitro shoots or GH adapted shoots were sampled for molecular
analysis.
Medium were used either autoclaved (except antibiotics, hormones, additives
such as L-cysteine,
Acetosyringon, imidazolinone components) or filter sterilized prepared (Agar
component
autoclaved, allowed to cool to 42 C and then used).
E. Seed Germination and Plant Growth in the Greenhouse and Field
Transformed plants were cultivated for seed production and phenotypic
assessment in both the
greenhouse and in the field. Greenhouse growth conditions were a sixteen hour
light period
followed by an eight hour dark period. The temperature was 20 degrees celsius
during the light
period (also called the day period) with a level of light corresponding to 200-
300 micromoles of
photons m-2 s-1 (this is the incident of light at the top of the plant and
lights were adjusted in
terms of distance from the plant to achieve this rate). During the day period
the range of light in
the greenhouse varied between 130 and 500 micromoles of photons m-2 s-1.
Getting out of the
day range just cited triggered either the use of artificial light to bring the
level up to 200-300
micromoles of photons m-2 s-1 or shading and/or shut off of lights to bring
the level back to 200-
300 micromoles of photons m-2 s-1. The dark period (also referred to as the
night period)
temperature was 18 C. Four hours before the light period began the temperature
was lowered to
15 C for the remainder of the dark period. Plants were irrigated and treated
for insects as
necessary. The soil type was 50 % Floradur B Seed + 50 % Floradur B Cutting
(including sand
and perlite) provided by Floragard (Oldenburg, Germany). Plant growth was
enhanced by nutrient
supplementation. Nutrients were combined with the daily watering. A 0.1% (w/v)
fertilizer solution
(Hakaphos Blue 15(N) -10 (P) - 15(K), Compo GmbH & Co KG, Munster, Germany)
was used to
water the plants. Water was supplied on demand (e.g. depending on plant growth
stage, water
consumption etc.). To avoid cross-pollination, plants were bagged at the time
when the first
flowers opened. Plants were checked daily in order to ensure that all open
flowers were covered
by the bags. Open flowers that were not covered properly were removed.
For field grown plants, the plants were grown in six locations which
correspond climatically to
USDA growth zones 3a-4b and 5a.The plants grown in the regions corresponding
to USDA growth
zones 3a-4b and 5a were grown in the summer. Standard horticultural practices
for canola were
followed. Netting and other measures to protect from birds and insects were
used as deemed
necessary by the growers, as were herbicides and fertilizer applications. The
planting density for
all locations was eighty seeds per square meter.
F. Lipid extraction and lipid analysis of plant oils
The results of genetic modifications in plants or on the production of a
desired molecule, e.g. a
certain fatty acid, were determined by growing the plant under suitable
conditions, e.g. as
described above, and analyzing the growth media and/or the cellular components
for enhanced
production of the desired molecule, e.g. lipids or a certain fatty acid.
Lipids were extracted as
described in the standard literature including Ullman, Encyclopedia of
Industrial Chemistry, Bd.
A2, S. 89-90 und S. 443-613, VCH: Weinheim (1985); Fallon, A., et al., (1987)
"Applications of
HPLC in Biochemistry" in: Laboratory Techniques in Biochemistry and Molecular
Biology, Bd. 17;
CA 02967131 2017-05-10
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PCT/EP2015/076608
Rehm et al. (1993) Biotechnology, Bd. 3, Kapitel 111: "Product recovery and
purification", S. 469-
714, VCH: Weinheim; Be!ter, P.A., et al. (1988) Bioseparations: downstream
processing for
Biotechnology, John Wiley and Sons; Kennedy, J.F., und Cabral, J.M.S. (1992)
Recovery
processes for biological Materials, John Wiley and Sons; Shaeiwitz, J.A., und
Henry, J.D. (1988)
Biochemical Separations, in: Ullmann's Encyclopedia of Industrial Chemistry,
Bd. B3; Kapitel 11,
S. 1-27, VCH: Weinheim; and Dechow, F.J. (1989) Separation and purification
techniques in
biotechnology, Noyes Publications.
It is acknowledged that extraction of lipids and fatty acids can be carried
out using other protocols
than those cited above, such as described in Cahoon et al. (1999) Proc. Natl.
Acad. Sci. USA 96
(22):12935-12940, and Browse et al. (1986) Analytic Biochemistry 152:141-145.
The protocols
used for quantitative and qualitative analysis of lipids or fatty acids are
described in Christie,
William W., Advances in Lipid Methodology, Ayr/Scotland: Oily Press (Oily
Press Lipid Library;
2); Christie, William W., Gas Chromatography and Lipids. A Practical Guide -
Ayr, Scotland: Oily
Press, 1989, Repr. 1992, IX, 307 S. (Oily Press Lipid Library; 1); "Progress
in Lipid Research,
Oxford: Pergamon Press, 1 (1952) - 16 (1977) u.d.T.: Progress in the Chemistry
of Fats and Other
Lipids CODEN.
To generate transgenic plants containing the genetic elements described in
example 1C for
production of EPA and DHA in seeds, rapeseed (Brassica napus) was transformed
as described
in 1D. Selected plants containing the genetic elements were grown until
development of mature
seeds under the conditions cited in Example 1E. Fatty acids from harvested
seeds were extracted
as described above and analyzed using gas chromatography as described above.
The content
(levels) of fatty acids is expressed throughout the present invention as
percentage (weight of a
particular fatty acid) of the (total weight of all fatty acids) contained in
the oil of seeds. Seed oil
content is expressed throughout the present invention as percentage of (oil
weight) of the (total
oil weight of seeds).
G. Compositional analysis of plant seed samples
The effect of genetic modification on seed composition was determined by
growing plants under
suitable conditions, e.g. as described above, and analyzing seed tissue for
specific compositional
parameters. Mature seed samples were milled into fine powder using a Foss
Knifetec 1095
Sample Mill and provided to Eurofins Nutrition Analysis Center (ENAC).
Specifically, Vitamin E
(tocopherol) content was measured by in milled seeds samples by ENAC using
methods MET-
VT-008 and MET-VT-030, both of which refer to the Association Of Analytical
Communities
method AOAC 971.30, and involve HPLC separation and quantification.
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Example 2: Plants containing the T-DNA of plasmid VC-LTM593-1qcz rc for
enhanced production
of tocopherol, and EPA and DHA in seeds
All genetic elements described in this example were transferred on a single T-
DNA using a BiBAC
plasmid into the plant genome. To this end, the plasmid VC-LTM593-1qcz rc was
cloned into
agrobacteria, and plant tissue was incubated according to example 1 with this
agrobacterial
culture. The genetic elements of VC-LTM593-1qcz rc and the function of each
element are listed
in Table 1. For convenience, all enzymes expressed in seeds of plants carrying
both T-DNA of
VC-LTM593-1qcz rc are additionally listed Table 2. In an embodiment, the
plant, plant part (in
particular seed), T-DNA, or construct of the present invention comprises some
desaturases
and/or elongases, or all desaturases and/or elongases as disclosed in the
Table.
Table 2: List of genes carried by the T-DNA of plasmid VC-LTM593-1qcz rc.
Preferred
polynucleotide and protein sequences are shown in column 4 and 5.
Genes encoding Len gth Enzymatic function and Polynucleotide
Protein
(bp)
enzmyes for EPA source of encoded SEQ ID NO: sequence
SEQ
and DHA synthesis protein ID NO
Delta-12 desaturase 265 266
c-d12Des(Ps_GA2) 1197 from Phythophthora
sojae
Delta-6 desaturase 261 262
c-d6Des(Ot_febit) 1371 from Ostreococcus
tauri
c-d6Elo(Pp GA2) 873 Delta-6 elongase from 257 258
_
Physcomitrella patens
Delta-6 elongase from 263 264
c-d6Elo(Tp_GA2) 819 Thalassiosira
pseudonana
Delta-5 desaturase 259 260
2 copies of c-
d5Des(Tc GA2) 1320 from Thraustochytrium
_
sp. ATCC21685
Omega-3-desaturase 269 270
c-o3Des(Pi_GA2) 1086 from Phythophthora
infestans
2 copies of c- 1092 Omega-3 desaturase 267 268
o3Des(Pir_GA) from Pythium irregulare
c-d5Elo(Ot_GA3) 903 Delta-5 elongase from 275 276
Ostreococcus tauri
Delta-4 desaturase 273 274
c-d4Des(PI_GA)2 1338
from Pavlova lutheri
Delta-4 desaturase 271 272
c-d4Des(Tc_GA3) 1560 from Thraustochytrium
sp.
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A. Fatty acid profiles, and vitamin E content of T2 plants carrying T-
DNAs of plasmids VC-
LTM593-1qcz rc cultivated in field trials in USDA growth zones 3a-4b and 5a
during the summer
Homozygous T2 plants from six independent transgenic events that contained 1-2
copies of the
T-DNA VC-LTM593-1qcz rc were grown in field locations according example 1. The
T3 seeds
were harvested and submitted for fatty acid analysis as described in example
1. Table 3 contains
fatty acid profile data across all samples from all locations, for each event.
Every event is capable
of making VLC-PUFAs in the field (ARA, EPA and DHA).
The same T3 seeds described in Table 3 were submitted for compositional
analysis as described
in example 1. To analyze the data, ANOVA was conducted using the software JMP
11Ø Analysis
was conducted at the 95% confidence level using Tukey test. To compensate for
unbalance in
the data obtained from the field trial (e.g. due to e.g. weather), Least
Square means instead of
means where used in the statistical analysis. Common letters in Table 3
indicate no significant
difference of the least square means. Based on this statistical analysis, one
event, LBFDAU,
contains higher gamma tocopherol and total tocopherol than the untransformed
Kumily control,
while all other events tend to have higher gamma- and total tocopherol levels
than Kumily, with
the exception of event LBFIH E.
The transgenic events described in Tables 3 and 4 all have decreased 18:1+18:2
content relative
to untransformed Kumily (18:1+18:2 = 80%). However, we did not observe any
significant
decrease in alpha-tocopherol content as would have been predicted based on Li
et al. (2013) J
Agric Food Chem 61:34-40. Instead, we observe increases in gamma-tocopherol
and total
tocopherol content, with the largest increase occurring in event LBFDAU that
produces the most
combined EPA+DHA. A correlation analysis was performed to reveal correlations
between VLC-
PUFA and tocopherols (Table 5). There we no significant correlations between
ARA (an n-6 fatty
acid) and any tocopherol components. On the other hand, significant positive
correlations were
observed between various tocopherols and EPA and DHA. Correlations
coefficients were
determined for the sum of all n-3 or all n-6 fatty acids 20 carbons in length
or greater. The
correlation between tocopherol of VLC-PUFA content is specific to n-3 fatty
acids. The highest
correlations were observed between n-3 fatty acids 20 carbon in length or
greater and gamma-,
delta-, and total tocopherols. Therefore, introduction of a biosynthetic
pathway that synthesizes
the 20 and 22 carbon n-3 VLC-PUFAs EPA, DPA, and DHA into plants also results
in an increase
in vitamin E content.
Table 3: Fatty acid profiles of T3 seeds harvested from T2 plants cultivated
in the field, corresponding to USDA growth zones 3a-4b and 5a, for field
trials of canola events containing the T-DNAs of plasmid VC-LTM593-1qcz rc.
The events are indicated in the first column, along with the number of
T3 seed aliquots representing a plot were measured per event. For event
LBFGKN, 36 plots and 60 single plants from those plots where measured. g
Per seed batch a random selection of -15 seed was measured in five technical
repeats. Values are the least square means standard deviation. t µ1 g
16:1 16:3 18:1 18:2 18:2 18:3 18:3 18:4 20:1 20:2 20:3
20:3 20:4 20:4 20:5 22:1 22:4 22:5 22:5 22:6 22:4 20:2
-1
Event 16:0 n-7 n-3 18:0 n-9 n-6 n-9 n-3 n-6 n-3 20:0 n-9 n-6 n-3 n-6 n-3
n-6 n-3 22:0 n-9 n-6 n-3 n-6 n-3 n-3 n-9
(...)
4.7 2.7 28.6 29.2 6.1 1.6 3.3
2.2 10.7 2.9 1.6 0.3
LBFDAU 0.2 0 1 0.3 0.7 0.7 0.1 0.1
2 0.3 0 0.3 0.1 0.3
(n=16) 0.1 O 0 0.1 1.5 0.7 0.1 0.3 0.1 +O +O +O +O +O 0.3 0.2 0.2 0.7 O 0 O
0.2 O 0.2 0.1 O
4.7 2.5 34.2 32.3 0.6 1.2
1.3 1.9 6.1 2.1 1.1 0.2
LBFDGG 0.2 0 7 0.2 0.6 0.8 0.1 0.1 2
0.3 0 0.3 0.1 0.1
(n=36) 0.1 O 0 0.2 1.9 1.2 0.1 0.5 0.1 +O +O +O +O +O 0.3 0.2 0.2 0.7 O 0 O
0.2 O 0.2 0.1 O
LBFGKN 4.6 2.6 33.7 32.8 0.6 7.5 0.9 0.8 2.1
1.2 1.8 0.3 2.1 P
(n=36+6 0.2 0 + + + + + + + 0.2 0.7 0.2 0.1
6 0.3 0 0.1 1 0.2 0.2 .
al il.2
0) 0.2 O 0 0.2 1.7 1.4 0.1 0.6 0.1 O O 0.1 O O 0.3 0.1 0.2 0.6
O 0 0.1 0.2 O 0.1 O O
0
4.8 2.6 31.2 33.9 0.6 6.7 1.3 0.7 2.1
1.2 2.4 6.7 0.3 1.9 1.2 0.2 ,
,
,
0
LBFIHE 0.2 0 + + + + + + 0.3 0.8 0.2 0.1 0.3 0 0.1 0.2
,
0
(n=36) 0.2 O 0 0.2 1.7 1.2 0.1 0.7 0.2 O 0.1 O O O 0.2 0.1 0.3 0.6 O 0
0.1 0.2 O 0.2 0.1 O
4.7 2.6 30.1 30.2 0.9 6.2 1.5 0.3 3.3
1.9 1.9 3.2 1.4 0.5 0.3
LBFLFK 0.2 0 + + + + + + + +
0.6 0.8 0.1 0.1 8.2 0.3 0 0.5 0.1
(n=36) 0.2 O 0 0.2 1.9 1.1 0.1 0.4 0.2 0.1 O O O O 0.3 0.2 0.2 1 O 0 O
0.4 O 0.3 0.1 0.1
4.8 2.6 28.4 32.7 0.8 5.7 1.6 0.3 2.3
1.2 3.8 2.4 1.1 0.2
LBFPRA 0.2 0 + + + + + + + +
0.7 0.8 0.2 0.1 9.6 0.3 0 0.3 0.1
0.1 'A
(n=36) 0.2 O 0 0.2 2.1 1.4 0.1 0.4 0.2 0.1 O O O O 0.3 0.2 0.5 1 O 0 O
0.3 O 0.2 O 0.1 'El
od
t.4
o
,-,
u,
O-
-1
o
o
o
oe
Table 4: Compositional analysis of T3 seeds of T2 plants cultivated in USDA
growth zones 3a-4b and 5a for field trials of canola events containing
the T-DNAs of plasmid VC- VC-LTM593-1qcz rc. The events are indicated in the
first column. The analysis has been done on 4 BULK, whereby
each BULK is a representative sample of all seeds harvedted from 4 different
geographic regions. Alpha-Tocopherol (mg/100g seed), Beta- 0
Tocopherol (mg/100g seed), Delta-Tocopherol (mg/100g seed), Gamma-Tocopherol
(mg/100g seed), Total Tocopherol (mg/100g seed). All results t µ1 g
have been normalized to the seed weight of seeds having 0% moisture. Values
are the least square means. Means that are not sharing a letter are
u,
significantly different at the 95% confidence level.
(...,
,-,
(...)
Alpha- Beta- Delta- Gamma- Tocopherols
EventOil (%)
Tocopherol Tocopherol Tocopherol Tocopherol (VitE)
LBFDAU 13.3 ab 0.25 a 0.58 a 29.5 a 43.7 a 37.716
bcd
LBFDGG 14.1 ab 0.23 a 0.45 bcd 25.6 b 40.4 abc 38.612 abcd
LBFGKN 12.9 b 0.23 a 0.52 abc 26.9 ab 40.6 abc 39.400 abc
LBFIHE 13.2 ab 0.23 a 0.45 bcd 22.0 cd 35.9 cde 39.639 abc
LBFLFK 12.5 b 0.23 a 0.52 abc 25.7 b 38.9 abc 37.233 cd
P
LBFPRA 13.6 ab 0.22 a 0.47 bcd 24.9 bc 39.2 abc 39.189 abcd
.
O)
Topas 14.7 ab 0.25 a 0.36 d 16.6 e 31.9 e
36.581 d c) .,.
Kumily 12.3 b 0.23 a 0.54 ab 24.4 bc 37.5 bcd 38.722 abcd
,
,
,
,
Control 1* 16.6 a 0.25 a 0.43 cd 24.1 bc 41.4
ab 38.923 abcd ,
Control 2* 12.0 b 0.20 a 0.45 bcd 20.8 d 33.5 de
40.567 a
*Controls 1 and 2 are not Kumily backgrounds
oo
n
1-i
m
oo
t.4
o
,-,
u,
O-
-1
o,
o,
oe
Table 5: Pearson correlation coefficients between fatty acids and tocopherols
from T3 seeds of T2 plants cultivated in USDA growth zones 3a-4b
and 5a for field trials of canola events containing the T-DNAs of plasmid VC-
VC-LTM593-1qcz rc. Correlations that are significant are indicated with
*** (p<0.05) or with * (p<0.10).
0
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Alpha- Beta- Gamma- Delta- Tocopherols
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Fatty Acid Tocopherol Tocopherol Tocopherol Tocopherol (VitE)
(...)
,-,
(...)
ARA (20:4n-6) 0.059 -0.151 -0.162 -0.167 -0.129
EPA (20:5n-3) 0.030 0.102 0.372* 0.488*** 0.389*
DPA (22:5n-3) 0.080 -0.035 0.001 0.147 0.056
DHA (22:6n-3) 0.222 0.449*** 0.319 0.543*** 0.447***
total n-3 (>200) 0.029 0.159 0.416*** 0.566*** 0.432***
total n-6 (<20C) -0.082 -0.119 0.143 0.218 0.096
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